HOW TO ADD PAYGO MASTER CARD TO GOOGLE
Open payments.google.com and sign in your gmail account (enter your gmail address and password).
Tap PAYMENTS CENTER
Tap PAYMENT METHODS
Tap ADD PAYMENT METHOD
Enter your PayGo Master Card details (Card number, expiration date, CVC) and your address (street number, city/town, postal code, and country should be Cambodia) and tap Save button.
When everything ready you will see your card in Payment methods.
Now you can make purchases on Google Play and other Google services.