In order to receive webhooks you shall have an endpoint to receive a "POST" request with an JSON conforming with the following structure:
{
"payorId": "string", // this is your own payor id
"event": "string", // the event name
"timestamp": Date, // the date-time the event was triggered
"data": {} // the event payload (see examples)
}
The event and data fields will differ from each event you subscribed to on Add Webhook.