Shopify copy app and add subscription system

I have a few shopify app tasks 1) It's hosted on one of shopify partners account, migrate it to another account 2) The app runs with trial and paid mode, for paid mode install payment button 3) If payment successful update a field on the database with value 2 4) If Payment failed to update the same field with value 1 Bid only if you worked with shopify app before, Post me at least 3 app you have designed fully.