I’m using TCPDF to generate a page of retail store bin tags. These tags include a 1D UPC barcode. The system has worked for years, save for one problem: manufacturers and/or distributors occasionally send out a UPC with the wrong checksum.

I’m using TCPDF to generate a page of retail store bin tags. These tags include a 1D UPC barcode. The system has worked for years, save for one problem: manufacturers and/or distributors occasionally send out a UPC with the wrong checksum.

I’m using TCPDF to generate a page of retail store bin tags. These tags include a 1D UPC barcode. The system has worked for years, save for one problem: manufacturers and/or distributors occasionally send out a UPC with the wrong checksum.

I’m using TCPDF to generate a page of retail store bin tags. These tags include a 1D UPC barcode. The system has worked for years, save for one problem: manufacturers and/or distributors occasionally send out a UPC with the wrong checksum.