Take billing permission

android/app/src/main/AndroidManifest.xml

@@ -30,4 +30,5 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="com.android.vending.BILLING" />
 </manifest>

pubspec.lock

@@ -333,6 +333,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.18"
+  in_app_purchase:
+    dependency: "direct main"
+    description:
+      name: in_app_purchase
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.4+16"
   intl:
     dependency: transitive
     description:
@@ -340,6 +347,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.16.1"
+  json_annotation:
+    dependency: transitive
+    description:
+      name: json_annotation
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.1"
   like_button:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -68,6 +68,7 @@ dependencies:
   pretty_dio_logger: ^1.1.1
   url_launcher: ^5.7.10
   fluttercontactpicker: ^3.1.0
+  in_app_purchase: ^0.3.4+16
 
 dev_dependencies:
   flutter_test: