Flutter iap subscription config

* The In-app product id should format: <package_id>_<type>_<number>. Ex: com.app.habitapp_yearly_000 (desc: Annual Subscription, Subscription Display Name: One year subscription, Description: Аll features of the app are available to you)

* The In-app product just works on real device

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Mobile site

libs

# in app purchase
  flutter_inapp_purchase:
    git:
      url: https://github.com/nhancv/flutter_inapp_purchase.git
  in_app_purchase: ^0.3.4+16
  shared_preferences: ^0.5.12+4

iOS

• Setup your in app products for ios in itunesconnect.

+ You need to complete the Agreements, Tax and Bankings.

+ Add In-App Purchases in Features tab. Check that your product’s status is Ready to Submit.

• Check your xcode setting and make In-App Purchase available.

Android

• Add billing permission Android manifest

<uses-permission android:name="com.android.vending.BILLING" />

* The importance to debug purchases on android is use release signingConfig in debug build type. Google Play Billing APIs only works with apps signed for production.

buildTypes {
        debug {
            debuggable true
            signingConfig signingConfigs.release
        }
        release {
            signingConfig…