Improved
Webhook API improvements
March 13th, 2026
Generate a test event notification API updates
You can now generate test event notifications for new webhook events with the Generate a test event notification API endpoint.
In the Generate a test event notification (POST /v3/subscriptions/{subscriptionId}/test) API request, you can now generate test event notifications for the invoice, spend.transaction, spend.reimbursement, and spend.threeDsChallenge events.
See POST /v3/subscriptions/{subscriptionId}/test in the API reference for more information.
User information in bill and invoice notifications
In the bill and invoice webhooks, we have introduced a new createdBy field in the event notifications. This field provides the BILL-generated ID of the user that created the bill or invoice record.
See AP bill notification payloads and AR invoice notification payloads for more information.