Get Default Fallback Route
What actually runs when no route claims a card payment.
Declared BEFORE /{route_id} for the same reason /matchers and
/engine-status are on the routing-rules router — FastAPI matches in
declaration order, and “default-fallback” would otherwise be captured as a
route id.
Authentication
AuthorizationBearer
Bearer authentication of the form Bearer <token>, where token is your auth token.
Path parameters
account_id
Response
Successful Response
processors
Errors
422
Unprocessable Entity Error