The ID of an existing [configuration](https://docs.stripe.com/api/customer_portal/configurations) to use for this session, describing its functionality and features. If not specified, the session uses the default configuration.

The ID of an existing customer.

The ID of an existing account.

Specifies which fields in the response should be expanded.

Information about a specific flow for the customer to go through. See the [docs](https://docs.stripe.com/customer-management/portal-deep-links) to learn more about using customer portal deep links and flows.

The IETF language tag of the locale customer portal is displayed in. If blank or auto, the customer’s `preferred_locales` or browser’s locale is used.

The `on_behalf_of` account to use for this session. When specified, only subscriptions and invoices with this `on_behalf_of` account appear in the portal. For more information, see the [docs](https://docs.stripe.com/connect/separate-charges-and-transfers#settlement-merchant). Use the [Accounts API](https://docs.stripe.com/api/accounts/object#account_object-settings-branding) to modify the `on_behalf_of` account's branding settings, which the portal displays.

The default URL to redirect customers to when they click on the portal's link to return to your website.