I read that "Currently, the In-app Billing API does not provide support for programmatically canceling subscriptions from inside the purchasing app", I would like to redirect the user to this page to manage his own subscription.
I am using the following package in_app_purchase to implement the In-app Module.
I'm not able to find how to open the subscription page from an application in Flutter.
You can launch the following URL. which will redirect to the Manage Subscription page in App Store for Apple.
launchUrl(Uri.parse("https://apps.apple.com/account/subscriptions"));
and u can launch the following URL for Android.
launchUrl(Uri.parse('https://play.google.com/store/account/subscriptions?sku=pro.monthly.testsku&package=com.example.app'));
with replacing the sku and package for Android.
You will need to add url_launcher in pubspec.yaml
and import this package too,
import 'package:url_launcher/url_launcher.dart';