Update Data in Googlesheet

Hi everybody,

I have created a barcode scanning app.
Everytime a barcode is recognized it shows information such as a location or a check date.(In the app)
This information can be updated by a user. In case there are changes, it should change the fields in the googlesheet.
What currently happens is that there is just a new row in the googlesheet with the info provided by the user and a row with the old info.

So what i would like to have:
If the Barcode is recognized, the row of the Barcode (in Googlesheet) should be edited/updated by the info the user provided.

Can someone help on this?




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