Your Plaid API `secret`. The `secret` is required and may be provided either in the `PLAID-SECRET` header or as part of a request body.

Your Plaid API `client_id`. The `client_id` is required and may be provided either in the `PLAID-CLIENT-ID` header or as part of a request body.

ID of the associated Identity Verification template. Like all Plaid identifiers, this is case-sensitive.

A unique ID that identifies the end user in your system. Either a `user_id` or the `client_user_id` must be provided. This ID can also be used to associate user-specific data from other Plaid products. Financial Account Matching requires this field and the `/link/token/create` `client_user_id` to be consistent. Personally identifiable information, such as an email address or phone number, should not be used in the `client_user_id`.

A unique user identifier, created by calling `/user/create`. Either a `user_id` or the `client_user_id` must be provided. The `user_id` may only be used instead of the `client_user_id` if you were not a pre-existing user of `/user/create` as of December 10, 2025; for more details, see [New User APIs](https://plaid.com/docs/api/users/user-apis). If both this field and the `client_user_id` are present in the request, the `user_id` must have been created from the provided `client_user_id`.

An identifier that determines which page of results you receive.