How can I link a client's account to an Android app?

[SmoothVibes]

Hey, I want to create an Android application where the user has the possibility to log in to their account. I would like this account to be the same account as the one on Shopify when they create an account on my website, so that I can retrieve their purchases, etc, directly on the Android application they will have at hand. Do you know if this is possible?