This diagram shows the transaction workflow for the Tap to Pay on Android Solution.

Figure:

Tap to Pay on Android Solution Transaction Workflow
Tap to Pay on Android Solution transaction workflow showing sequence of
                    events
  1. The Android point-of-sale (POS) app integrates to the Tap to Pay on Android SDK.
  2. The merchant's Android POS app sends a request to the Tap to Pay on Android SDK to process a payment.
  3. The Tap to Pay on Android SDK user interface (UI) opens on the Android device screen and guides the customer through the payment flow.
  4. The Tap to Pay on Android SDK sends a response with the transaction result and details to the Android POS app.