Braintree and Paperform forms get along great! To connect an existing Braintree account with your Paperform account, just do the following:

1. Go to Account Settings → Account Services.
2. Click the “Connect Braintree” button.
3. Enter the required details (you can find more information and instructions on how to obtain the relevant details on Braintree's website).
4. Click the “Connect Account” button.

Once your Braintree account has been connected to your Paperform account, you can use it for payments and subscriptions by choosing it as the Payment Account under Configure → Payments in the form editor.