// File generated from our OpenAPI spec

declare module 'stripe' {
  namespace Stripe {
    /**
     * The Subscription object.
     */
    interface Subscription {
      /**
       * Unique identifier for the object.
       */
      id: string;

      /**
       * String representing the object's type. Objects of the same type share the same value.
       */
      object: 'subscription';

      /**
       * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the application owner's Stripe account.
       */
      application_fee_percent: number | null;

      /**
       * Determines the date of the first full invoice, and, for plans with `month` or `year` intervals, the day of the month for subsequent invoices.
       */
      billing_cycle_anchor: number;

      /**
       * Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period
       */
      billing_thresholds: Subscription.BillingThresholds | null;

      /**
       * A date in the future at which the subscription will automatically get canceled
       */
      cancel_at: number | null;

      /**
       * If the subscription has been canceled with the `at_period_end` flag set to `true`, `cancel_at_period_end` on the subscription will be true. You can use this attribute to determine whether a subscription that has a status of active is scheduled to be canceled at the end of the current period.
       */
      cancel_at_period_end: boolean;

      /**
       * If the subscription has been canceled, the date of that cancellation. If the subscription was canceled with `cancel_at_period_end`, `canceled_at` will reflect the time of the most recent update request, not the end of the subscription period when the subscription is automatically moved to a canceled state.
       */
      canceled_at: number | null;

      /**
       * Either `charge_automatically`, or `send_invoice`. When charging automatically, Stripe will attempt to pay this subscription at the end of the cycle using the default source attached to the customer. When sending an invoice, Stripe will email your customer an invoice with payment instructions.
       */
      collection_method: Subscription.CollectionMethod | null;

      /**
       * Time at which the object was created. Measured in seconds since the Unix epoch.
       */
      created: number;

      /**
       * End of the current period that the subscription has been invoiced for. At the end of this period, a new invoice will be created.
       */
      current_period_end: number;

      /**
       * Start of the current period that the subscription has been invoiced for.
       */
      current_period_start: number;

      /**
       * ID of the customer who owns the subscription.
       */
      customer: string | Stripe.Customer | Stripe.DeletedCustomer;

      /**
       * Number of days a customer has to pay invoices generated by this subscription. This value will be `null` for subscriptions where `collection_method=charge_automatically`.
       */
      days_until_due: number | null;

      /**
       * ID of the default payment method for the subscription. It must belong to the customer associated with the subscription. This takes precedence over `default_source`. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_payment_method: string | Stripe.PaymentMethod | null;

      /**
       * ID of the default payment source for the subscription. It must belong to the customer associated with the subscription and be in a chargeable state. If `default_payment_method` is also set, `default_payment_method` will take precedence. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_source: string | Stripe.CustomerSource | null;

      /**
       * The tax rates that will apply to any subscription item that does not have `tax_rates` set. Invoices created will have their `default_tax_rates` populated from the subscription.
       */
      default_tax_rates?: Array<Stripe.TaxRate> | null;

      /**
       * Describes the current discount applied to this subscription, if there is one. When billing, a discount applied to a subscription overrides a discount applied on a customer-wide basis.
       */
      discount: Stripe.Discount | null;

      /**
       * If the subscription has ended, the date the subscription ended.
       */
      ended_at: number | null;

      /**
       * List of subscription items, each with an attached price.
       */
      items: ApiList<Stripe.SubscriptionItem>;

      /**
       * The most recent invoice this subscription has generated.
       */
      latest_invoice: string | Stripe.Invoice | null;

      /**
       * Has the value `true` if the object exists in live mode or the value `false` if the object exists in test mode.
       */
      livemode: boolean;

      /**
       * Set of [key-value pairs](https://stripe.com/docs/api/metadata) that you can attach to an object. This can be useful for storing additional information about the object in a structured format.
       */
      metadata: Stripe.Metadata;

      /**
       * Specifies the approximate timestamp on which any pending invoice items will be billed according to the schedule provided at `pending_invoice_item_interval`.
       */
      next_pending_invoice_item_invoice: number | null;

      /**
       * If specified, payment collection for this subscription will be paused.
       */
      pause_collection: Subscription.PauseCollection | null;

      /**
       * Specifies an interval for how often to bill for any pending invoice items. It is analogous to calling [Create an invoice](https://stripe.com/docs/api#create_invoice) for the given subscription at the specified interval.
       */
      pending_invoice_item_interval: Subscription.PendingInvoiceItemInterval | null;

      /**
       * You can use this [SetupIntent](https://stripe.com/docs/api/setup_intents) to collect user authentication when creating a subscription without immediate payment or updating a subscription's payment method, allowing you to optimize for off-session payments. Learn more in the [SCA Migration Guide](https://stripe.com/docs/billing/migration/strong-customer-authentication#scenario-2).
       */
      pending_setup_intent: string | Stripe.SetupIntent | null;

      /**
       * If specified, [pending updates](https://stripe.com/docs/billing/subscriptions/pending-updates) that will be applied to the subscription once the `latest_invoice` has been paid.
       */
      pending_update: Subscription.PendingUpdate | null;

      /**
       * The schedule attached to the subscription
       */
      schedule: string | Stripe.SubscriptionSchedule | null;

      /**
       * Date when the subscription was first created. The date might differ from the `created` date due to backdating.
       */
      start_date: number;

      /**
       * Possible values are `incomplete`, `incomplete_expired`, `trialing`, `active`, `past_due`, `canceled`, or `unpaid`.
       *
       * For `collection_method=charge_automatically` a subscription moves into `incomplete` if the initial payment attempt fails. A subscription in this state can only have metadata and default_source updated. Once the first invoice is paid, the subscription moves into an `active` state. If the first invoice is not paid within 23 hours, the subscription transitions to `incomplete_expired`. This is a terminal state, the open invoice will be voided and no further invoices will be generated.
       *
       * A subscription that is currently in a trial period is `trialing` and moves to `active` when the trial period is over.
       *
       * If subscription `collection_method=charge_automatically` it becomes `past_due` when payment to renew it fails and `canceled` or `unpaid` (depending on your subscriptions settings) when Stripe has exhausted all payment retry attempts.
       *
       * If subscription `collection_method=send_invoice` it becomes `past_due` when its invoice is not paid by the due date, and `canceled` or `unpaid` if it is still not paid by an additional deadline after that. Note that when a subscription has a status of `unpaid`, no subsequent invoices will be attempted (invoices will be created, but then immediately automatically closed). After receiving updated payment information from a customer, you may choose to reopen and pay their closed invoices.
       */
      status: Subscription.Status;

      /**
       * The account (if any) the subscription's payments will be attributed to for tax reporting, and where funds from each payment will be transferred to for each of the subscription's invoices.
       */
      transfer_data: Subscription.TransferData | null;

      /**
       * If the subscription has a trial, the end of that trial.
       */
      trial_end: number | null;

      /**
       * If the subscription has a trial, the beginning of that trial.
       */
      trial_start: number | null;
    }

    namespace Subscription {
      interface BillingThresholds {
        /**
         * Monetary threshold that triggers the subscription to create an invoice
         */
        amount_gte: number | null;

        /**
         * Indicates if the `billing_cycle_anchor` should be reset when a threshold is reached. If true, `billing_cycle_anchor` will be updated to the date/time the threshold was last reached; otherwise, the value will remain unchanged. This value may not be `true` if the subscription contains items with plans that have `aggregate_usage=last_ever`.
         */
        reset_billing_cycle_anchor: boolean | null;
      }

      type CollectionMethod = 'charge_automatically' | 'send_invoice';

      interface PauseCollection {
        /**
         * The payment collection behavior for this subscription while paused. One of `keep_as_draft`, `mark_uncollectible`, or `void`.
         */
        behavior: PauseCollection.Behavior;

        /**
         * The time after which the subscription will resume collecting payments.
         */
        resumes_at: number | null;
      }

      namespace PauseCollection {
        type Behavior = 'keep_as_draft' | 'mark_uncollectible' | 'void';
      }

      interface PendingInvoiceItemInterval {
        /**
         * Specifies invoicing frequency. Either `day`, `week`, `month` or `year`.
         */
        interval: PendingInvoiceItemInterval.Interval;

        /**
         * The number of intervals between invoices. For example, `interval=month` and `interval_count=3` bills every 3 months. Maximum of one year interval allowed (1 year, 12 months, or 52 weeks).
         */
        interval_count: number;
      }

      namespace PendingInvoiceItemInterval {
        type Interval = 'day' | 'month' | 'week' | 'year';
      }

      interface PendingUpdate {
        /**
         * If the update is applied, determines the date of the first full invoice, and, for plans with `month` or `year` intervals, the day of the month for subsequent invoices.
         */
        billing_cycle_anchor: number | null;

        /**
         * The point after which the changes reflected by this update will be discarded and no longer applied.
         */
        expires_at: number;

        /**
         * List of subscription items, each with an attached plan, that will be set if the update is applied.
         */
        subscription_items: Array<Stripe.SubscriptionItem> | null;

        /**
         * Unix timestamp representing the end of the trial period the customer will get before being charged for the first time, if the update is applied.
         */
        trial_end: number | null;

        /**
         * Indicates if a plan's `trial_period_days` should be applied to the subscription. Setting `trial_end` per subscription is preferred, and this defaults to `false`. Setting this flag to `true` together with `trial_end` is not allowed.
         */
        trial_from_plan: boolean | null;
      }

      type Status =
        | 'active'
        | 'canceled'
        | 'incomplete'
        | 'incomplete_expired'
        | 'past_due'
        | 'trialing'
        | 'unpaid';

      interface TransferData {
        /**
         * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the destination account. By default, the entire amount is transferred to the destination.
         */
        amount_percent: number | null;

        /**
         * The account where funds from the payment will be transferred to upon payment success.
         */
        destination: string | Stripe.Account;
      }
    }

    interface SubscriptionCreateParams {
      /**
       * The identifier of the customer to subscribe.
       */
      customer: string;

      /**
       * A list of prices and quantities that will generate invoice items appended to the first invoice for this subscription. You may pass up to 10 items.
       */
      add_invoice_items?: Array<SubscriptionCreateParams.AddInvoiceItem>;

      /**
       * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the application owner's Stripe account. The request must be made by a platform account on a connected account in order to set an application fee percentage. For more information, see the application fees [documentation](https://stripe.com/docs/connect/subscriptions#collecting-fees-on-subscriptions).
       */
      application_fee_percent?: number;

      /**
       * For new subscriptions, a past timestamp to backdate the subscription's start date to. If set, the first invoice will contain a proration for the timespan between the start date and the current time. Can be combined with trials and the billing cycle anchor.
       */
      backdate_start_date?: number;

      /**
       * A future timestamp to anchor the subscription's [billing cycle](https://stripe.com/docs/subscriptions/billing-cycle). This is used to determine the date of the first full invoice, and, for plans with `month` or `year` intervals, the day of the month for subsequent invoices.
       */
      billing_cycle_anchor?: number;

      /**
       * Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period. Pass an empty string to remove previously-defined thresholds.
       */
      billing_thresholds?: Stripe.Emptyable<
        SubscriptionCreateParams.BillingThresholds
      >;

      /**
       * A timestamp at which the subscription should cancel. If set to a date before the current period ends, this will cause a proration if prorations have been enabled using `proration_behavior`. If set during a future period, this will always cause a proration for that period.
       */
      cancel_at?: number;

      /**
       * Boolean indicating whether this subscription should cancel at the end of the current period.
       */
      cancel_at_period_end?: boolean;

      /**
       * Either `charge_automatically`, or `send_invoice`. When charging automatically, Stripe will attempt to pay this subscription at the end of the cycle using the default source attached to the customer. When sending an invoice, Stripe will email your customer an invoice with payment instructions. Defaults to `charge_automatically`.
       */
      collection_method?: SubscriptionCreateParams.CollectionMethod;

      /**
       * The code of the coupon to apply to this subscription. A coupon applied to a subscription will only affect invoices created for that particular subscription.
       */
      coupon?: string;

      /**
       * Number of days a customer has to pay invoices generated by this subscription. Valid only for subscriptions where `collection_method` is set to `send_invoice`.
       */
      days_until_due?: number;

      /**
       * ID of the default payment method for the subscription. It must belong to the customer associated with the subscription. This takes precedence over `default_source`. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_payment_method?: string;

      /**
       * ID of the default payment source for the subscription. It must belong to the customer associated with the subscription and be in a chargeable state. If `default_payment_method` is also set, `default_payment_method` will take precedence. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_source?: string;

      /**
       * The tax rates that will apply to any subscription item that does not have `tax_rates` set. Invoices created will have their `default_tax_rates` populated from the subscription.
       */
      default_tax_rates?: Stripe.Emptyable<Array<string>>;

      /**
       * Specifies which fields in the response should be expanded.
       */
      expand?: Array<string>;

      /**
       * A list of up to 20 subscription items, each with an attached price.
       */
      items?: Array<SubscriptionCreateParams.Item>;

      /**
       * Set of [key-value pairs](https://stripe.com/docs/api/metadata) that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to `metadata`.
       */
      metadata?: Stripe.Emptyable<Stripe.MetadataParam>;

      /**
       * Indicates if a customer is on or off-session while an invoice payment is attempted.
       */
      off_session?: boolean;

      /**
       * Use `allow_incomplete` to create subscriptions with `status=incomplete` if the first invoice cannot be paid. Creating subscriptions with this status allows you to manage scenarios where additional user actions are needed to pay a subscription's invoice. For example, SCA regulation may require 3DS authentication to complete payment. See the [SCA Migration Guide](https://stripe.com/docs/billing/migration/strong-customer-authentication) for Billing to learn more. This is the default behavior.
       *
       * Use `error_if_incomplete` if you want Stripe to return an HTTP 402 status code if a subscription's first invoice cannot be paid. For example, if a payment method requires 3DS authentication due to SCA regulation and further user action is needed, this parameter does not create a subscription and returns an error instead. This was the default behavior for API versions prior to 2019-03-14. See the [changelog](https://stripe.com/docs/upgrades#2019-03-14) to learn more.
       *
       * `pending_if_incomplete` is only used with updates and cannot be passed when creating a subscription.
       */
      payment_behavior?: SubscriptionCreateParams.PaymentBehavior;

      /**
       * Specifies an interval for how often to bill for any pending invoice items. It is analogous to calling [Create an invoice](https://stripe.com/docs/api#create_invoice) for the given subscription at the specified interval.
       */
      pending_invoice_item_interval?: Stripe.Emptyable<
        SubscriptionCreateParams.PendingInvoiceItemInterval
      >;

      /**
       * The API ID of a promotion code to apply to this subscription. A promotion code applied to a subscription will only affect invoices created for that particular subscription.
       */
      promotion_code?: string;

      /**
       * Determines how to handle [prorations](https://stripe.com/docs/subscriptions/billing-cycle#prorations) resulting from the `billing_cycle_anchor`. Valid values are `create_prorations` or `none`.
       *
       * Passing `create_prorations` will cause proration invoice items to be created when applicable. Prorations can be disabled by passing `none`. If no value is passed, the default is `create_prorations`.
       */
      proration_behavior?: SubscriptionCreateParams.ProrationBehavior;

      /**
       * If specified, the funds from the subscription's invoices will be transferred to the destination and the ID of the resulting transfers will be found on the resulting charges.
       */
      transfer_data?: SubscriptionCreateParams.TransferData;

      /**
       * Unix timestamp representing the end of the trial period the customer will get before being charged for the first time. This will always overwrite any trials that might apply via a subscribed plan. If set, trial_end will override the default trial period of the plan the customer is being subscribed to. The special value `now` can be provided to end the customer's trial immediately. Can be at most two years from `billing_cycle_anchor`.
       */
      trial_end?: 'now' | number;

      /**
       * Indicates if a plan's `trial_period_days` should be applied to the subscription. Setting `trial_end` per subscription is preferred, and this defaults to `false`. Setting this flag to `true` together with `trial_end` is not allowed.
       */
      trial_from_plan?: boolean;

      /**
       * Integer representing the number of trial period days before the customer is charged for the first time. This will always overwrite any trials that might apply via a subscribed plan.
       */
      trial_period_days?: number;
    }

    namespace SubscriptionCreateParams {
      interface AddInvoiceItem {
        /**
         * The ID of the price object.
         */
        price?: string;

        /**
         * Data used to generate a new [Price](https://stripe.com/docs/api/prices) object inline.
         */
        price_data?: AddInvoiceItem.PriceData;

        /**
         * Quantity for this item. Defaults to 1.
         */
        quantity?: number;

        /**
         * The tax rates which apply to the item. When set, the `default_tax_rates` do not apply to this item.
         */
        tax_rates?: Stripe.Emptyable<Array<string>>;
      }

      namespace AddInvoiceItem {
        interface PriceData {
          /**
           * Three-letter [ISO currency code](https://www.iso.org/iso-4217-currency-codes.html), in lowercase. Must be a [supported currency](https://stripe.com/docs/currencies).
           */
          currency: string;

          /**
           * The ID of the product that this price will belong to.
           */
          product: string;

          /**
           * A positive integer in %s (or 0 for a free price) representing how much to charge.
           */
          unit_amount?: number;

          /**
           * Same as `unit_amount`, but accepts a decimal value in %s with at most 12 decimal places. Only one of `unit_amount` and `unit_amount_decimal` can be set.
           */
          unit_amount_decimal?: string;
        }
      }

      interface BillingThresholds {
        /**
         * Monetary threshold that triggers the subscription to advance to a new billing period
         */
        amount_gte?: number;

        /**
         * Indicates if the `billing_cycle_anchor` should be reset when a threshold is reached. If true, `billing_cycle_anchor` will be updated to the date/time the threshold was last reached; otherwise, the value will remain unchanged.
         */
        reset_billing_cycle_anchor?: boolean;
      }

      type CollectionMethod = 'charge_automatically' | 'send_invoice';

      interface Item {
        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period. When updating, pass an empty string to remove previously-defined thresholds.
         */
        billing_thresholds?: Stripe.Emptyable<Item.BillingThresholds>;

        /**
         * Set of [key-value pairs](https://stripe.com/docs/api/metadata) that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to `metadata`.
         */
        metadata?: Stripe.MetadataParam;

        /**
         * Plan ID for this item, as a string.
         */
        plan?: string;

        /**
         * The ID of the price object.
         */
        price?: string;

        /**
         * Data used to generate a new [Price](https://stripe.com/docs/api/prices) object inline.
         */
        price_data?: Item.PriceData;

        /**
         * Quantity for this item.
         */
        quantity?: number;

        /**
         * A list of [Tax Rate](https://stripe.com/docs/api/tax_rates) ids. These Tax Rates will override the [`default_tax_rates`](https://stripe.com/docs/api/subscriptions/create#create_subscription-default_tax_rates) on the Subscription. When updating, pass an empty string to remove previously-defined tax rates.
         */
        tax_rates?: Stripe.Emptyable<Array<string>>;
      }

      namespace Item {
        interface BillingThresholds {
          /**
           * Usage threshold that triggers the subscription to advance to a new billing period
           */
          usage_gte: number;
        }

        interface PriceData {
          /**
           * Three-letter [ISO currency code](https://www.iso.org/iso-4217-currency-codes.html), in lowercase. Must be a [supported currency](https://stripe.com/docs/currencies).
           */
          currency: string;

          /**
           * The ID of the product that this price will belong to.
           */
          product: string;

          /**
           * The recurring components of a price such as `interval` and `usage_type`.
           */
          recurring: PriceData.Recurring;

          /**
           * A positive integer in %s (or 0 for a free price) representing how much to charge.
           */
          unit_amount?: number;

          /**
           * Same as `unit_amount`, but accepts a decimal value in %s with at most 12 decimal places. Only one of `unit_amount` and `unit_amount_decimal` can be set.
           */
          unit_amount_decimal?: string;
        }

        namespace PriceData {
          interface Recurring {
            /**
             * Specifies billing frequency. Either `day`, `week`, `month` or `year`.
             */
            interval: Recurring.Interval;

            /**
             * The number of intervals between subscription billings. For example, `interval=month` and `interval_count=3` bills every 3 months. Maximum of one year interval allowed (1 year, 12 months, or 52 weeks).
             */
            interval_count?: number;
          }

          namespace Recurring {
            type Interval = 'day' | 'month' | 'week' | 'year';
          }
        }
      }

      type PaymentBehavior =
        | 'allow_incomplete'
        | 'error_if_incomplete'
        | 'pending_if_incomplete';

      interface PendingInvoiceItemInterval {
        /**
         * Specifies invoicing frequency. Either `day`, `week`, `month` or `year`.
         */
        interval: PendingInvoiceItemInterval.Interval;

        /**
         * The number of intervals between invoices. For example, `interval=month` and `interval_count=3` bills every 3 months. Maximum of one year interval allowed (1 year, 12 months, or 52 weeks).
         */
        interval_count?: number;
      }

      namespace PendingInvoiceItemInterval {
        type Interval = 'day' | 'month' | 'week' | 'year';
      }

      type ProrationBehavior = 'always_invoice' | 'create_prorations' | 'none';

      interface TransferData {
        /**
         * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the destination account. By default, the entire amount is transferred to the destination.
         */
        amount_percent?: number;

        /**
         * ID of an existing, connected Stripe account.
         */
        destination: string;
      }
    }

    interface SubscriptionRetrieveParams {
      /**
       * Specifies which fields in the response should be expanded.
       */
      expand?: Array<string>;
    }

    interface SubscriptionUpdateParams {
      /**
       * A list of prices and quantities that will generate invoice items appended to the first invoice for this subscription. You may pass up to 10 items.
       */
      add_invoice_items?: Array<SubscriptionUpdateParams.AddInvoiceItem>;

      /**
       * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the application owner's Stripe account. The request must be made by a platform account on a connected account in order to set an application fee percentage. For more information, see the application fees [documentation](https://stripe.com/docs/connect/subscriptions#collecting-fees-on-subscriptions).
       */
      application_fee_percent?: number;

      /**
       * Either `now` or `unchanged`. Setting the value to `now` resets the subscription's billing cycle anchor to the current time. For more information, see the billing cycle [documentation](https://stripe.com/docs/billing/subscriptions/billing-cycle).
       */
      billing_cycle_anchor?: SubscriptionUpdateParams.BillingCycleAnchor;

      /**
       * Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period. Pass an empty string to remove previously-defined thresholds.
       */
      billing_thresholds?: Stripe.Emptyable<
        SubscriptionUpdateParams.BillingThresholds
      >;

      /**
       * A timestamp at which the subscription should cancel. If set to a date before the current period ends, this will cause a proration if prorations have been enabled using `proration_behavior`. If set during a future period, this will always cause a proration for that period.
       */
      cancel_at?: Stripe.Emptyable<number>;

      /**
       * Boolean indicating whether this subscription should cancel at the end of the current period.
       */
      cancel_at_period_end?: boolean;

      /**
       * Either `charge_automatically`, or `send_invoice`. When charging automatically, Stripe will attempt to pay this subscription at the end of the cycle using the default source attached to the customer. When sending an invoice, Stripe will email your customer an invoice with payment instructions. Defaults to `charge_automatically`.
       */
      collection_method?: SubscriptionUpdateParams.CollectionMethod;

      /**
       * The code of the coupon to apply to this subscription. A coupon applied to a subscription will only affect invoices created for that particular subscription.
       */
      coupon?: string;

      /**
       * Number of days a customer has to pay invoices generated by this subscription. Valid only for subscriptions where `collection_method` is set to `send_invoice`.
       */
      days_until_due?: number;

      /**
       * ID of the default payment method for the subscription. It must belong to the customer associated with the subscription. This takes precedence over `default_source`. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_payment_method?: string;

      /**
       * ID of the default payment source for the subscription. It must belong to the customer associated with the subscription and be in a chargeable state. If `default_payment_method` is also set, `default_payment_method` will take precedence. If neither are set, invoices will use the customer's [invoice_settings.default_payment_method](https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-default_payment_method) or [default_source](https://stripe.com/docs/api/customers/object#customer_object-default_source).
       */
      default_source?: string;

      /**
       * The tax rates that will apply to any subscription item that does not have `tax_rates` set. Invoices created will have their `default_tax_rates` populated from the subscription. Pass an empty string to remove previously-defined tax rates.
       */
      default_tax_rates?: Stripe.Emptyable<Array<string>>;

      /**
       * Specifies which fields in the response should be expanded.
       */
      expand?: Array<string>;

      /**
       * A list of up to 20 subscription items, each with an attached price.
       */
      items?: Array<SubscriptionUpdateParams.Item>;

      /**
       * Set of [key-value pairs](https://stripe.com/docs/api/metadata) that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to `metadata`.
       */
      metadata?: Stripe.Emptyable<Stripe.MetadataParam>;

      /**
       * Indicates if a customer is on or off-session while an invoice payment is attempted.
       */
      off_session?: boolean;

      /**
       * If specified, payment collection for this subscription will be paused.
       */
      pause_collection?: Stripe.Emptyable<
        SubscriptionUpdateParams.PauseCollection
      >;

      /**
       * Use `allow_incomplete` to transition the subscription to `status=past_due` if a payment is required but cannot be paid. This allows you to manage scenarios where additional user actions are needed to pay a subscription's invoice. For example, SCA regulation may require 3DS authentication to complete payment. See the [SCA Migration Guide](https://stripe.com/docs/billing/migration/strong-customer-authentication) for Billing to learn more. This is the default behavior.
       *
       * Use `pending_if_incomplete` to update the subscription using [pending updates](https://stripe.com/docs/billing/subscriptions/pending-updates). When you use `pending_if_incomplete` you can only pass the parameters [supported by pending updates](https://stripe.com/docs/billing/pending-updates-reference#supported-attributes).
       *
       * Use `error_if_incomplete` if you want Stripe to return an HTTP 402 status code if a subscription's invoice cannot be paid. For example, if a payment method requires 3DS authentication due to SCA regulation and further user action is needed, this parameter does not update the subscription and returns an error instead. This was the default behavior for API versions prior to 2019-03-14. See the [changelog](https://stripe.com/docs/upgrades#2019-03-14) to learn more.
       */
      payment_behavior?: SubscriptionUpdateParams.PaymentBehavior;

      /**
       * Specifies an interval for how often to bill for any pending invoice items. It is analogous to calling [Create an invoice](https://stripe.com/docs/api#create_invoice) for the given subscription at the specified interval.
       */
      pending_invoice_item_interval?: Stripe.Emptyable<
        SubscriptionUpdateParams.PendingInvoiceItemInterval
      >;

      /**
       * The promotion code to apply to this subscription. A promotion code applied to a subscription will only affect invoices created for that particular subscription.
       */
      promotion_code?: string;

      /**
       * Determines how to handle [prorations](https://stripe.com/docs/subscriptions/billing-cycle#prorations) when the billing cycle changes (e.g., when switching plans, resetting `billing_cycle_anchor=now`, or starting a trial), or if an item's `quantity` changes. Valid values are `create_prorations`, `none`, or `always_invoice`.
       *
       * Passing `create_prorations` will cause proration invoice items to be created when applicable. These proration items will only be invoiced immediately under [certain conditions](https://stripe.com/docs/subscriptions/upgrading-downgrading#immediate-payment). In order to always invoice immediately for prorations, pass `always_invoice`.
       *
       * Prorations can be disabled by passing `none`.
       */
      proration_behavior?: SubscriptionUpdateParams.ProrationBehavior;

      /**
       * If set, the proration will be calculated as though the subscription was updated at the given time. This can be used to apply exactly the same proration that was previewed with [upcoming invoice](https://stripe.com/docs/api#retrieve_customer_invoice) endpoint. It can also be used to implement custom proration logic, such as prorating by day instead of by second, by providing the time that you wish to use for proration calculations.
       */
      proration_date?: number;

      /**
       * If specified, the funds from the subscription's invoices will be transferred to the destination and the ID of the resulting transfers will be found on the resulting charges. This will be unset if you POST an empty value.
       */
      transfer_data?: Stripe.Emptyable<SubscriptionUpdateParams.TransferData>;

      /**
       * Unix timestamp representing the end of the trial period the customer will get before being charged for the first time. This will always overwrite any trials that might apply via a subscribed plan. If set, trial_end will override the default trial period of the plan the customer is being subscribed to. The special value `now` can be provided to end the customer's trial immediately. Can be at most two years from `billing_cycle_anchor`.
       */
      trial_end?: 'now' | number;

      /**
       * Indicates if a plan's `trial_period_days` should be applied to the subscription. Setting `trial_end` per subscription is preferred, and this defaults to `false`. Setting this flag to `true` together with `trial_end` is not allowed.
       */
      trial_from_plan?: boolean;
    }

    namespace SubscriptionUpdateParams {
      interface AddInvoiceItem {
        /**
         * The ID of the price object.
         */
        price?: string;

        /**
         * Data used to generate a new [Price](https://stripe.com/docs/api/prices) object inline.
         */
        price_data?: AddInvoiceItem.PriceData;

        /**
         * Quantity for this item. Defaults to 1.
         */
        quantity?: number;

        /**
         * The tax rates which apply to the item. When set, the `default_tax_rates` do not apply to this item.
         */
        tax_rates?: Stripe.Emptyable<Array<string>>;
      }

      namespace AddInvoiceItem {
        interface PriceData {
          /**
           * Three-letter [ISO currency code](https://www.iso.org/iso-4217-currency-codes.html), in lowercase. Must be a [supported currency](https://stripe.com/docs/currencies).
           */
          currency: string;

          /**
           * The ID of the product that this price will belong to.
           */
          product: string;

          /**
           * A positive integer in %s (or 0 for a free price) representing how much to charge.
           */
          unit_amount?: number;

          /**
           * Same as `unit_amount`, but accepts a decimal value in %s with at most 12 decimal places. Only one of `unit_amount` and `unit_amount_decimal` can be set.
           */
          unit_amount_decimal?: string;
        }
      }

      type BillingCycleAnchor = 'now' | 'unchanged';

      interface BillingThresholds {
        /**
         * Monetary threshold that triggers the subscription to advance to a new billing period
         */
        amount_gte?: number;

        /**
         * Indicates if the `billing_cycle_anchor` should be reset when a threshold is reached. If true, `billing_cycle_anchor` will be updated to the date/time the threshold was last reached; otherwise, the value will remain unchanged.
         */
        reset_billing_cycle_anchor?: boolean;
      }

      type CollectionMethod = 'charge_automatically' | 'send_invoice';

      interface Item {
        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period. When updating, pass an empty string to remove previously-defined thresholds.
         */
        billing_thresholds?: Stripe.Emptyable<Item.BillingThresholds>;

        /**
         * Delete all usage for a given subscription item. Allowed only when `deleted` is set to `true` and the current plan's `usage_type` is `metered`.
         */
        clear_usage?: boolean;

        /**
         * A flag that, if set to `true`, will delete the specified item.
         */
        deleted?: boolean;

        /**
         * Subscription item to update.
         */
        id?: string;

        /**
         * Set of [key-value pairs](https://stripe.com/docs/api/metadata) that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to `metadata`.
         */
        metadata?: Stripe.Emptyable<Stripe.MetadataParam>;

        /**
         * Plan ID for this item, as a string.
         */
        plan?: string;

        /**
         * The ID of the price object.
         */
        price?: string;

        /**
         * Data used to generate a new [Price](https://stripe.com/docs/api/prices) object inline.
         */
        price_data?: Item.PriceData;

        /**
         * Quantity for this item.
         */
        quantity?: number;

        /**
         * A list of [Tax Rate](https://stripe.com/docs/api/tax_rates) ids. These Tax Rates will override the [`default_tax_rates`](https://stripe.com/docs/api/subscriptions/create#create_subscription-default_tax_rates) on the Subscription. When updating, pass an empty string to remove previously-defined tax rates.
         */
        tax_rates?: Stripe.Emptyable<Array<string>>;
      }

      namespace Item {
        interface BillingThresholds {
          /**
           * Usage threshold that triggers the subscription to advance to a new billing period
           */
          usage_gte: number;
        }

        interface PriceData {
          /**
           * Three-letter [ISO currency code](https://www.iso.org/iso-4217-currency-codes.html), in lowercase. Must be a [supported currency](https://stripe.com/docs/currencies).
           */
          currency: string;

          /**
           * The ID of the product that this price will belong to.
           */
          product: string;

          /**
           * The recurring components of a price such as `interval` and `usage_type`.
           */
          recurring: PriceData.Recurring;

          /**
           * A positive integer in %s (or 0 for a free price) representing how much to charge.
           */
          unit_amount?: number;

          /**
           * Same as `unit_amount`, but accepts a decimal value in %s with at most 12 decimal places. Only one of `unit_amount` and `unit_amount_decimal` can be set.
           */
          unit_amount_decimal?: string;
        }

        namespace PriceData {
          interface Recurring {
            /**
             * Specifies billing frequency. Either `day`, `week`, `month` or `year`.
             */
            interval: Recurring.Interval;

            /**
             * The number of intervals between subscription billings. For example, `interval=month` and `interval_count=3` bills every 3 months. Maximum of one year interval allowed (1 year, 12 months, or 52 weeks).
             */
            interval_count?: number;
          }

          namespace Recurring {
            type Interval = 'day' | 'month' | 'week' | 'year';
          }
        }
      }

      interface PauseCollection {
        /**
         * The payment collection behavior for this subscription while paused. One of `keep_as_draft`, `mark_uncollectible`, or `void`.
         */
        behavior: PauseCollection.Behavior;

        /**
         * The time after which the subscription will resume collecting payments.
         */
        resumes_at?: number;
      }

      namespace PauseCollection {
        type Behavior = 'keep_as_draft' | 'mark_uncollectible' | 'void';
      }

      type PaymentBehavior =
        | 'allow_incomplete'
        | 'error_if_incomplete'
        | 'pending_if_incomplete';

      interface PendingInvoiceItemInterval {
        /**
         * Specifies invoicing frequency. Either `day`, `week`, `month` or `year`.
         */
        interval: PendingInvoiceItemInterval.Interval;

        /**
         * The number of intervals between invoices. For example, `interval=month` and `interval_count=3` bills every 3 months. Maximum of one year interval allowed (1 year, 12 months, or 52 weeks).
         */
        interval_count?: number;
      }

      namespace PendingInvoiceItemInterval {
        type Interval = 'day' | 'month' | 'week' | 'year';
      }

      type ProrationBehavior = 'always_invoice' | 'create_prorations' | 'none';

      interface TransferData {
        /**
         * A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the destination account. By default, the entire amount is transferred to the destination.
         */
        amount_percent?: number;

        /**
         * ID of an existing, connected Stripe account.
         */
        destination: string;
      }
    }

    interface SubscriptionListParams extends PaginationParams {
      /**
       * The collection method of the subscriptions to retrieve. Either `charge_automatically` or `send_invoice`.
       */
      collection_method?: SubscriptionListParams.CollectionMethod;

      created?: Stripe.RangeQueryParam | number;

      current_period_end?: Stripe.RangeQueryParam | number;

      current_period_start?: Stripe.RangeQueryParam | number;

      /**
       * The ID of the customer whose subscriptions will be retrieved.
       */
      customer?: string;

      /**
       * Specifies which fields in the response should be expanded.
       */
      expand?: Array<string>;

      /**
       * The ID of the plan whose subscriptions will be retrieved.
       */
      plan?: string;

      /**
       * Filter for subscriptions that contain this recurring price ID.
       */
      price?: string;

      /**
       * The status of the subscriptions to retrieve. Passing in a value of `canceled` will return all canceled subscriptions, including those belonging to deleted customers. Pass `ended` to find subscriptions that are canceled and subscriptions that are expired due to [incomplete payment](https://stripe.com/docs/billing/subscriptions/overview#subscription-statuses). Passing in a value of `all` will return subscriptions of all statuses.
       */
      status?: SubscriptionListParams.Status;
    }

    namespace SubscriptionListParams {
      type CollectionMethod = 'charge_automatically' | 'send_invoice';

      type Status =
        | 'active'
        | 'all'
        | 'canceled'
        | 'ended'
        | 'incomplete'
        | 'incomplete_expired'
        | 'past_due'
        | 'trialing'
        | 'unpaid';
    }

    interface SubscriptionDeleteParams {
      /**
       * Specifies which fields in the response should be expanded.
       */
      expand?: Array<string>;

      /**
       * Will generate a final invoice that invoices for any un-invoiced metered usage and new/pending proration invoice items.
       */
      invoice_now?: boolean;

      /**
       * Will generate a proration invoice item that credits remaining unused time until the subscription period end.
       */
      prorate?: boolean;
    }

    interface SubscriptionDeleteDiscountParams {}

    class SubscriptionsResource {
      /**
       * Creates a new subscription on an existing customer. Each customer can have up to 500 active or scheduled subscriptions.
       */
      create(
        params: SubscriptionCreateParams,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;

      /**
       * Retrieves the subscription with the given ID.
       */
      retrieve(
        id: string,
        params?: SubscriptionRetrieveParams,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;
      retrieve(
        id: string,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;

      /**
       * Updates an existing subscription on a customer to match the specified parameters. When changing plans or quantities, we will optionally prorate the price we charge next month to make up for any price changes. To preview how the proration will be calculated, use the [upcoming invoice](https://stripe.com/docs/api#upcoming_invoice) endpoint.
       */
      update(
        id: string,
        params?: SubscriptionUpdateParams,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;

      /**
       * By default, returns a list of subscriptions that have not been canceled. In order to list canceled subscriptions, specify status=canceled.
       */
      list(
        params?: SubscriptionListParams,
        options?: RequestOptions
      ): ApiListPromise<Stripe.Subscription>;
      list(options?: RequestOptions): ApiListPromise<Stripe.Subscription>;

      /**
       * Cancels a customer's subscription immediately. The customer will not be charged again for the subscription.
       *
       * Note, however, that any pending invoice items that you've created will still be charged for at the end of the period, unless manually [deleted](https://stripe.com/docs/api#delete_invoiceitem). If you've set the subscription to cancel at the end of the period, any pending prorations will also be left in place and collected at the end of the period. But if the subscription is set to cancel immediately, pending prorations will be removed.
       *
       * By default, upon subscription cancellation, Stripe will stop automatic collection of all finalized invoices for the customer. This is intended to prevent unexpected payment attempts after the customer has canceled a subscription. However, you can resume automatic collection of the invoices manually after subscription cancellation to have us proceed. Or, you could check for unpaid invoices before allowing the customer to cancel the subscription at all.
       */
      del(
        id: string,
        params?: SubscriptionDeleteParams,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;
      del(
        id: string,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.Subscription>>;

      /**
       * Removes the currently applied discount on a subscription.
       */
      deleteDiscount(
        id: string,
        params?: SubscriptionDeleteDiscountParams,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.DeletedDiscount>>;
      deleteDiscount(
        id: string,
        options?: RequestOptions
      ): Promise<Stripe.Response<Stripe.DeletedDiscount>>;
    }
  }
}