Match user info

i have developed apps in retool , now what i need to do is i need to have a login/Auth page (for customers ) there information in google sheets i want match there names then after login submit the customer to his profile ,
i don't want theme as users i only want theme order and edit there profiles
Any Ideas how can I achieve this ?

If you are trying to authenticate external users into your app, and don't want them as ReTool users... I think you will have to implement it yourself. You'll have to setup OAuth or name/pass and deal with the table and mappings manually.