Log in to the application

Respected members, please help. I made an application for employees so that they could know their salaries through the MasterCard numbers of each employee. I succeeded in this by designing a project on Google Script and adding the link inside the application through the web viewer, and the application is working now. Now I have stored the employees’ MasterCard numbers on a Google Sheet file, and now I want only the people whose numbers are in the Google Sheet file to be able to open the application and log in to the application. And not just anyone

Do you think it is a good idea to store Mastercard numbers? I don‘t think so for security reasons

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