Help me implement a simple micropayement (In APP purchase) in a Gdevelop project (can export to Cordova)

I have a Gdevelop5 game all ready to use, for ANDROID. I would like to implement a micropayement (just one, remove ads) on a specific page. I am not skilled enough to do it. Nor via JS (Gdevelop5 has its own javascript events, GDJS) nor via Cordova/PhoneGap. Indeed I could also export the game in Cordova, but I still don't have the skills in Cordova and/or Android Studio to implement a micropayment and reflect it on my game variable. I would need someone to guide me step by step, either in implementing the JS event in Gdevelop5 or in implementing the add-on on Cordova and set the game variable to reflect it. It is a one time job, if you are expert in this it shouldn't take long: it is only about one page and one glonbal variable. I need someone who knows exactly what they are doing, no research ! We can always discuss fees if the micro-project category seems to small to you. Thanks, hope to meet with you soon.