Send a PayPal batch payout to multiple recipients using the Payouts API

Steps

1. Obtain an access token via POST /v1/oauth2/token with your client credentials using Basic Auth.
2. Construct a batch payout body with sender_batch_header (sender_batch_id for idempotency, email_subject, recipient_type) and a list of items each containing receiver, amount, and note.
3. Submit the batch via POST /v1/payments/payouts; save the returned payout_batch_id.
4. Poll the batch status via GET /v1/payments/payouts/{payout_batch_id} until batch_status is 'SUCCESS' or 'DENIED'.
5. For individual item failures, inspect each payout item's transaction_status and errors array; re-queue failed items with corrected data.
6. Subscribe to PAYMENT.PAYOUTSBATCH.DENIED and PAYMENT.PAYOUTS-ITEM.FAILED webhook events for asynchronous failure notification.