Adds card(s) and/or recipient(s) to an autopayout. Added members will be automatically loaded (if cards) or have bank payments initiated (if recipients) based on the amount and schedule defined in the autopayout.
This operation is idempotent with respect to membership: a card that is already a member of the autopayout is treated as successfully present rather than as an error, so re-submitting an already-connected card returns 200 rather than failing.
Card IDs are validated up front and the request is rejected as a whole if any card cannot be added (for example, a card that does not exist, belongs to a different business, or is in a status ineligible for autopayout).
A request therefore either fully succeeds or makes no changes; there is no partial application.