I need to launch an app where the customers choose the box size (3 options) and add items to it (multiple brands) and choose it to be a one time purchase or a subscription based purchase and then check out and pay via card, COD or paytm. The customers will have to authenticate using phone number so an OTP system. Also an analytics system in place to see my sales. Also an option to redeem codes or references to reduce cost.
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What platform(s) is this app being developed for? Can you be more specific in the type of app this will be? Do you have any existing code base or are you starting from scratch?