I uploaded a screenshot of the code coding blocks I have so far that is just the barcode scanner.
Welcome Ethan.
One way to post data to GoogleSpreadsheet METRIC RAT AI2 - Google Sheets - Simple POST and GET Data or METRIC RAT AI2 - Post Data to a Google Sheet
or you can use the App Inventor Spreadsheet control if you have a Google developer account Spreadsheet
Here's a sample: