Refining the online store on Woocommerce

There is an online store on the Woodmart theme, it is necessary for each registered user to assign an individual discount card to use it instead of a plastic card in an offline store. We plan to make a webview app and pwa. Accordingly, the map should also be displayed in the applications (in the users LK).
It is desirable to implement the assigning of the card automatically from the database (which we will change once a year), but we will consider the options and manual.
From you:
Cost?
Time?
Implementation option with a description for a non-programmer (process, maybe plug-in or widget, etc.