CB Paid Subscriptions

Authorize.net deprecated silent post. This was sudden and unforseen. Their replacement API is not backwards compatible (webhooks). This means a full rewrite of the gateway, which still won't fix existing recurring payments, to be fully functional again. This is just a ticket to track plans to either rewrite the gateway or deprecate then later remove.

https://developer.authorize.net/api/reference/index.html#recurring-billing
https://developer.authorize.net/api/reference/features/webhooks.html#