1. create the form and add some input fields like: credit_no, cvv, amount, exp_date
2. and then submit the form , the transcation will pass those value into braintree
3. braintree will return the transaction result->success when the transaction is ok.
4. when transaction is success, you can create the customer account into braintree at the same time, you can take the customer account to do some transcation for the later use.