Create ACH Authorization
Authentication
Request
Reference/ID for the customer’s authenticated session at consent time.
A key unique to this intended checkout (a UUID you generate is fine). Passing the same key on a retried call returns the original authorization instead of creating a duplicate.
Required when authenticating as merchant-admin/admin (no customer session to resolve one from); ignored for customer session-key calls, where the customer is resolved from the session instead.
Response
The founding ACH payment’s external paymentId, linked in once that
payment is created. Unset until then — the authorization itself must
exist before its founding payment does. achAuthorizationId on
checkout/subsequent-debit calls always refers to this record’s own
_id, not this field.

