hi, The 'Billing Agreement Id' is the Subscription Id in the PAYMENT.SALE.COMPLETED event. See a sample below. { "id": "WH-72J78916XW253041B-5HG111500B361204H", "event_version": "1.0", "create_time": "2019-11-08T19:18:05.489Z", "resource_type": "sale", "event_type": "PAYMENT.SALE.COMPLETED", "summary": "Payment completed for $ 11.0 USD", "resource": { "id": "8VD9479630095983G", "state": "completed", "amount": { "total": "11.00", "currency": "USD", "details": { "subtotal": "11.00" } }, "payment_mode": "INSTANT_TRANSFER", "protection_eligibility": "ELIGIBLE", "protection_eligibility_type": "ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE", "transaction_fee": { "value": "0.62", "currency": "USD" }, "invoice_number": "", "billing_agreement_id": "I-GPVDFDPJEXGP", "create_time": "2019-11-08T19:17:53Z", "update_time": "2019-11-08T19:17:53Z", "links": [ { "href": "https://api.sandbox.paypal.com/v1/payments/sale/8VD9479630095983G", "rel": "self", "method": "GET" }, { "href": "https://api.sandbox.paypal.com/v1/payments/sale/8VD9479630095983G/refund", "rel": "refund", "method": "POST" } ] }, "links": [ { "href": "https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-72J78916XW253041B-5HG111500B361204H", "rel": "self", "method": "GET" }, { "href": "https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-72J78916XW253041B-5HG111500B361204H/resend", "rel": "resend", "method": "POST" } ] }
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