There is great support forum of developer’s website!.
Authorize.net Payment Addon
Authorize.NET add-on allows you to charge one-time membership fees to your site or blog using the Authorize.NET payment gateway. The add-on makes it easier for you to set predefined payments and let users pay while signing up. Users can only access the content once their transaction is successful. It also generates an email alert to the users informing them about their transaction and its status. This builds efficiency and transparency in how you conduct your business and facilitates your users.
- Add payment fields on the registration form.
- Set a predefined amount for the payment field.
- The user can login only after payment completes successfully.
- Email communication for Pending and Completed Payment.