With Payments API applications can sell virtual products to users or provide them with services using VK internal currency — votes. 

Unlike the old approach when interim user accounts inside the application were used to make payments, new payments API uses a transactional model. This makes mutual payments more comfortable and secure and enables cancellation of payments to return funds spent by users. 

Step-by-Step Guide for Payments API Connection

• Payment dialog box — preparing the application that users purchase products with.
• Processing of payment notifications — preparing the server end for work with the payment system.
• Test mode — description of the test mode.
• Description of Payments API methods — program interface for orders management.
• Payments in application currency — using the application currency in VK special applications.

• Notification handler example in PHP — code example to handle notifications and respond to them.