There are small things - e.g. you can't do weekly / fortnightly billing. Once I discovered that I stopped investigating BT for our primary subscription engine.

There are small things - e.g. you can't do weekly / fortnightly billing. Once I discovered that I stopped investigating BT for our primary subscription engine. We just hold the card tokens and use BT to charge the card. It's not ideal, but it does give us more flexibility.