Qr code scanner, and check in google sheets

hello everyone, question and request for help,
I want to make a qr scanner in kodlar, so that the scanned code is comparable to the code base in google sheets, if it is a checkpoint, four checkpoints are marked, after marking the last one, the button to go to the next page is activated

Just start your project step by step… do the tutorials to learn the basics, search the community for simular projects and snippets and if you got stuck, post a screenshot of your relevant blocks