Link QR machine to Vending Machine

For $3 — Ends 17 Jul 2018 (in 4 days) need you to link my vending machine to QR code, so that my customer can just scan the QR code of the vending machine and use the machine.
I have database and website already, all you need to do is to write the program to link the hardware which contain sim card from the vending machine to my website and database.
The hardware on the vending machine will be provided. But, we do not have the code for the hardward
example : - $750.0

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