How can I add a QR code / bar code in the PDF against an entry that can be used to fetch the details later?

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The best way to implement that is to add a single cell and align the text to the center then type {qr_code} in it. This way you will be able to resize the size of the code in the PDF by changing the cell size. This will autogenerate a QR Code in the PDF that is generated post submission.

How do I fetch the values from a master on scanning a Barcode or QR code against a particular item?

I want to fetch values from a master by scanning the QR code. How to do that?

I want to scan QR code of employees and fetch the name, employee id etc. However the location doesn't have proper internet to fetch data from the cloud. Can I achieve this?

I have created an application where I am storing the QR of an item with stock qty 1. There is another application called ... doesn't have Dynamic filter feature.

How can I add a QR code / bar code in the PDF against an entry that can be used to fetch the details later?

Where am I?

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