InAppPurchase needed refactor. (!READ DESCRIPTION)

1) ---------------> Please check the existing logic that I attached as a file <--------------. (Just copy it to new class in Studio). Now it calls the Play Market and call subscriptions I have there. I have created and set up subscriptions on Play Market. 2) I need to have: - 1 type subscription with regular monthly payment (for example 5$ per month) - 2 type subscription with 3 months payments (for example 15$ charge for 3 months) 3) Set up 1 free month trial before it starts charges 4) After 1st subscription done need to save details in the firebase. Save date that is +1 month of the current date in the database. So the app will make a call to the play market only after 30 days. 5) Create activity stub that suppose to block app if subscription is not active. Handle the positive and negative scenarios: - Positive - Subscription is active - open payed features - Negative - Subscription is inactive - close payed features 6) Need to handle all errors that might happen while user subscribing by showing proper dialog window with proper message as a description P.S. For now Back end verification while testing you will call Play Market directly from the device. After that you will make it through the back end. For back end you can use node.js in firebase Here is the detailed task [login to view URL]