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Tools like firebase provide a device id that changes less often [1], maybe you can try to remember the device id that perfomed the purchase instead of (or along with) the user. But then, if the same user has a tablet and a phone he can still get two orders, or if he uninstall and reinstall the app and the id changes. In general: security is never absolute,...


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If it is just about ordering "once a day", why don't you track the shipping adddress & name of the customer. Otherwise you could always check the person behind that account. Verify with their bank, credit institues or anyone else that offers ident solutions and fraud & compliance services. Over here in germany for example, the public post office (...


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