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javaandroidgoogle-playgoogle-play-servicesandroid-billing

Android Billing how to use setAccountId or assign payment to custom identifier

I would like to **allow my users using my app across multiple devices **. Users have to log into my app through firebase auth.

Problem is that payments are assigned to account that is signed on the device (google play), not with account signed into the app.** From firebase auth I can get an email address of the user of my app - this could be used as some unique identifier.

Problem visualized:

Problem visualized

I noticed that in Billing flow there is .setAccountId("some id") I think I could use this to fill in a unique identifier of a user. But how can use it querying purchases?

BillingFlowParams.Builder builder = new BillingFlowParams.Builder()
                .setAccountId("some id")
                .setSku(PREMIUM_YEAR_SUBS).setType(BillingClient.SkuType.SUBS);

TLDR: All I want to do is to retrieve purchases that are connected to my APP user account, not device account (google play currently logged in user).

Solution

  • To implement billing using accountId, try using the getBuyIntentExtraParams() method which provides additional functionality as compared with getBuyIntent() method.

    With this method, you may use accountId with the following description:

    Optional obfuscated string that is uniquely associated with the user's account in your app. If you pass this value, Google Play can use it to detect irregular activity, such as many devices making purchases on the same account in a short period of time.

    Additionally, you may want to also check the typical purchase flow with the In-app Billing API discussed here.