Google User Choice Alternative Billing methods are not listing into Flutter Android?

Question

We are using the "in-app_purchase" for flutter app. For Android we have used the Google Play billing and that is not working fine.

Now we completed the configurations for "User Choice Alternative Billing" methods on google all the steps done and added the UCB for India. We have added the Razor-pay for UBC (User billing choice) for alternative billing choices. But only the Google play methods are coming only the Alternative Billing options are not coming into the popup of the Google play while purchasing. See the image also