get https://{youraccountname}.api-us1.com/api/3/webhooks/
Retrieve an existing webhook
{
"webhook": {
"cdate": "2016-01-01T12:00:00-00:00",
"listid": "0",
"name": "My hook",
"url": "http://example.com/my-hook",
"events": [
"subscribe",
"unsubscribe",
"sent"
],
"sources": [
"admin",
"api",
"system"
],
"links": [],
"id": "1"
}
}