i built my android app by compiling html,css,and java in adobe phonegap.I need though to create a monthly subscription plan and i read a lot of information that made me comfused.From what i understood((if i understood well)) i have to use a key wich i got from developer console and somehow edit my config.xml filebut i dont know what to do and i appreciate any advice.by the way thats my code bellow
<?xml version="1.0" encoding="UTF-8" ?><widget xmlns = "http://www.w3.org/ns/widgets" xmlns:gap = "http://phonegap.com/ns/1.0" id = "com.phonegap.alphanutrition" versionCode = "11" version = "1.0.0"><!-- versionCode is optional and Android only --><name> ΤΟ CALCULATOR ΤΟΥΝΕΦΡΟΠΑΘΗ</name><description>ΤΟ CALCULATOR ΤΟΥΝΕΦΡΟΠΑΘΗ</description><author href="https://build.phonegap.com" email="support@phonegap.com">ΤΟ CALCULATOR ΤΟΥΝΕΦΡΟΠΑΘΗ</author><preference name="android-targetSdkVersion" value="28" /><platform name="android"><edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application" xmlns:android="http://schemas.android.com/apk/res/android"><uses-permission android:name="com.android.vending.BILLING" /></edit-config></platform></widget>`