I think you will have to do some more research and ask more specific questions around the areas you need support. We can't really just explain how to build a loyalty app from scratch.
There are a number of existing loyalty solutions, you may want to take a look at them.
Also considered if your loyalty idea is specific for one merchant or vertical. Otherwise, perhaps one of the existing solutions will work?
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Hello Raymond our app cloopcard is been approved and is available to dowload
Is it possible to connect our developer Clover device to our demo production account?
Duplicate App On sandbox and Production
Getting 404 Not Found in new production app
For oauth2 to work in production should i submit my application from developer settings