Created a test topic on GC pubsub and can create pull subscriptions no problem but as soon as I try to create a URL endpoint subscription I get a "pubsub error INVALID_ARGUMENT"
Params Subscription Name: testingsub Endpoint URL: https://requestb.in/1iztlqt1
Any ideas what I am doing wrong
If you look at the message returned with this error, you should get some more details. A common cause of this issue is that you haven't registered the endpoint. You need to verify that you own the domain in order to register it as a push endpoint.