Banklink authorization

To call the Banklink API on behalf of a user, get an access token from PayoutID with the authorization code grant and the Banklink scopes you need: BLAISP, BLIBAN or BLPISP.

1. Redirect the user. Send the user to Authorize user with the Banklink scopes in scope.
2. The user approves. The user logs in to PayoutID, or registers, and approves the requested access.
3. Exchange the code. Exchange the returned code for an access token at Retrieve token.
4. Call the Banklink API. Send the access token in the Authorization header.

The user does not need a separate Banklink account: Banklink creates its record of the user on the first API call. With the client credentials grant, the Banklink user is your application itself.