Test a webhook

Sends sample notifications to test if the webhook is set up correctly. We send four test notifications for each event code you choose. They cover success and failure scenarios for the hard-coded currencies EUR and GBP, regardless of the currencies configured in the merchant accounts. For custom notifications, we only send the specified custom notification. The response describes the result of the test. The `status` field tells you if the test was successful or not. You can use the other fie...