Update single cell of airtable

Hello everybody.

I’m trying to make a charity points card (the points accumulated by users turn into money that goes to charity).

At the moment I can:

  • log in with firebase
  • create a user profile for client, business or non-profit. Each time a profile is created, based on the category, a row is created in a different airtable table.

When a company creates a profile, the company should be able to scan the user’s QR code and, based on the user’s expense, upload points to his card.

I can not:

  • find user ID
  • upload points to the specific user.

I enclose the project.
Thanks to anyone who can help me