In-app purchases with multiple accounts

Solution 1:

It seems like there isn't a one way road to solve this, but let's try do this.

1. When the user first install the app get his/her primary email or all accounts on the device

2. Ask the user what email will they be using for future payment/ or which account is active for google play.

   you can use this code to get the account

   Pattern emailPattern = Patterns.EMAIL_ADDRESS; // API level 8+
   Account[] accounts = AccountManager.get(context).getAccounts();
   for (Account account : accounts) {
       if (emailPattern.matcher(account.name).matches()) {
           String possibleEmail = account.name;
           ...
       }
   }
   

   Don't forget to ask for permission

   <uses-permission android:name="android.permission.GET_ACCOUNTS" />
   

   After the user selects the email, you can send a link via email to confirm this email address

3. Lead all the payment to that specific email.

Method 2

Use the new "Send & Receive money using Gmail" future

1. Create a email intent and send specific data to the email intent and make payments.

2. Upon success, send a code to the user email

3. Use the code to activate whatever purchased they make.

Method 3

Use another payment library or gateway for your in app purchase instead of Google play.