Am I getting the steps right for verifying a user’s Android in-app subscription?

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As it turns out, my steps were not correct. It took me weeks to figure this out and it doesn’t seem to be documented anywhere else. You’re welcome:

  1. Create a Web Application account in the Google APIs Console. Put any website as a “redirect URI”; it doesn’t matter since you will not really be using it. You will get a client id and client secret when you create the account.

  2. In a browser on your computer go to https://accounts.google.com/o/oauth2/auth?scope=https://www.googleapis.com/auth/androidpublisher&response_type=code&access_type=offline&redirect_uri=[YOUR REDIRECT URI]&client_id=[YOUR CLIENT ID] and allow access when prompted.

  3. Look in the address bar. At the end of the URI you entered originally will be your refresh token. It looks like 1/.... You will need this “code” in the next step. The refresh token never expires.

  4. Convert this “code” to a “refresh token” by going to https://accounts.google.com/o/oauth2/token?client_id=[YOUR CLIENT ID]&client_secret=[YOUR CLIENT SECRET]&code=[CODE FROM PREVIOUS STEP]&grant_type=authorization_code&redirect_uri=[YOUR REDIRECT URI]. You can save the resulting value right in your program; it never expires unless explicitly revoked. (this step inserted by @BrianWhite — see comments)
    Make sure you are using POST.(inserted by Gintas)

  5. In your code, send an HttpPost request to https://accounts.google.com/o/oauth2/token with the BasicNameValuePairs "grant_type","refresh_token", "client_id",[YOUR CLIENT ID], "client_secret",[YOUR CLIENT SECRET], "refresh_token",[YOUR REFRESH TOKEN]. For an example look here. You will need to do this in a separate thread, probably using AsyncTask. This will return a JSONObject.

  6. Get the access token from the returned JSONObject. For an example look here. You will need to get the string “access_token”. The access token expires in 1 hour.

  7. In your code, send an HttpGet request to https://www.googleapis.com/androidpublisher/v1/applications/[YOUR APP'S PACKAGE NAME]/subscriptions/[THE ID OF YOUR PUBLISHED SUBSCRIPTION FROM YOUR ANDROID DEVELOPER CONSOLE]/purchases/[THE PURCHASE TOKEN THE USER RECEIVES UPON PURCHASING THE SUBSCRIPTION]?accesstoken="[THE ACCESS TOKEN FROM STEP 4]". For an example look here.

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