Renewable subscription packages will be added to my ios application -- 2

Hello, I have one mobile application code for ios. There are in app packages currently available in this application. The user must be a member of the subscription packages to be able to operate in the application. But the existing subscription code inside works incorrectly because it is old and full of errors. I want you to remove existing in app code in this app and install renewable subscription packages from scratch. These subscription packages should be weekly , monthly and yearly . Please only people with experience in this field write to me.