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Webhook Event Types

Opkit’s webhooks implementation supports a number of different event types, each representing a different event within the Opkit system.

Registering a Webhook

You can register a webhook endpoint from the settings page of the Opkit dashboard.

Implementing a Webhook Endpoint

To start receiving webhook events, create a publicly-accessible HTTP POST endpoint on your server. We also recommend saving raw webhook events to a new database table.

At-Least-Once Delivery

Opkit provides an at-least-once guarantee for the delivery of webhook events. This means Opkit will repeatedly send a webhook event to your server until endpoint until it receives a 200 HTTP status code in response. Note that “at-least-once” does not mean the same thing as “exactly-once”. Due to Opkit’s retry logic, it is possible for your backend system to receive the same webhook event more than once.


Opkit will resend webhook events under certain circumstances, for example if your server endpoint responds with a non-200 HTTP status code. To avoid any bad side effects resulting from this behavior, you should implement your webhook in such a way that it is idempotent. You can use the webhook event “id” field as an idempotency key.

Replaying Webhook Events

Unfortunately, Opkit does not support the capability to replay webhook events at this time. Once a webhook event has been marked “delivered” by Opkit’s servers, it cannot be re-sent.