Creates and triggers a payout from the merchant custodial balance to a previously-registered destination account (bank or wallet). When X-On-Behalf-Of is set to a sub-merchant id, the payout is debited from the sub-merchant's custodial wallet and uses the sub-merchant's destination accounts. The destination account must belong to the merchant (or sub-merchant) identified by the request.

This endpoint is intended for custodial (Inflow-managed) wallets. Non-custodial (Privy-based) merchants must use the dashboard flow that includes an explicit signature step.