Simulate Test Notification

Sends a simulated earned-reward notification to the issuer's configured webhook for the given event, without requiring a real transaction. Provide the userId and transactionId to include in the simulated transaction; offer information is sourced from an existing offer in sandbox, so the payload matches a production notification and is HMAC-signed like any other.

A fresh eventId is generated on each call, so the triggered notification is listable and replayable just like a real one. Returns 409 when the issuer has no enabled subscription for the requested event.

<b>Sandbox environment only.</b> This endpoint is available only in Kard's test (sandbox) environment. It does not exist in production.<br/> <b>Required scopes:</b> notifications:write