I actually have a mobile version of my system where user has to login with email/password.
I would like to create an application for Android and IOS where user would login just once and the credentials would be stored in the phone.
When user run the application again , the application would just ask user for a 4 digit code and the application would check the stored credentials + code to validate login with our database.
Once logged in the application would just run our mobile version.
We would also need a logout button.
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Dear Client, Please keep trust on us we can surely do your project. We are really interested to work with you and build a healthy longterm relationship. Warm Regards, Om Infowave