Payload Agent Enrollment

1. For payload customers, they can now “enroll” agents by using the agents > billing > payment methods page.
   1. This will only be visible for offices that are connected to payload (payload setting turned on, and they have their secret key copied into the payload setup page).
   2. When they select an agent, it will display any payment methods that payload knows about this agent. For example if they have paid an invoice previously and added a payment method.
   3. The admin can add bank account or credit card information and mark it as a “default” payment method.
   4. There is no “edit” or “delete” of payment methods, but you can flag a new payment method as default and it will override any previous default methods.