Validate Payout Sender

Validates a payout sender (either an existing one by ID, or inline sender data) against a specific payout method's required fields.

Validate sender details using either the payout_sender_id or the provided payout_sender object details.

Note: Provide either payout_sender_id (to validate an existing sender) OR payout_sender (to validate inline data) — not both. payout_method_name is always required.