Looking over page calls for Froms 2.0 I noticed that the endpoint wasn't leadCapture/Save but it was leadCapture/Save2. And also that this endpoint accepts JSON no longer XML form url-encoded. This excites me because as a developer. I use json in almost all of my Front-end javascript applications and it would be great to get more insight and documentation on this.
The error I recieve now is No Subscription ID - which I don't know where to pass that. Adding documentation on this endpoint would be great and I think a step forward towards a full REST API.