Today, security requires more than just passwords. Users' access should be restricted using multi-factor or two-factor authentication. It can be through text messages, calls, or anything.
The user’s system should automatically log out after a brief time of inactivity, similar to banking websites. Although users are used to session timeouts, they choose convenience above security.
Owners can alter third-party apps. Third-party apps must retain no authority to store your user's data. So you should resist the urge even if they provide more usability features outside the app.
Confirm Recurring Payments
The app should require confirmation if a user makes a payment and wants a repeat transaction. It ought to terminate the transaction if the user disputes making the payment.
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