I want to make an app that has a username password authentication, can scan products barcode and calculate the checkout money. It will be connected to firebase for stock database and customers data, Is this possible?
Yes, you can 
Have fun !
Thanks for the help, I am going to read the documentation, but is there any tips you would like to give ?
Plan it all out on paper
As you build, test at every change
Get others to test too, they will find what you have missed
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