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My voucher PDF files are corrupted. Why?

This is normally because PHP isn't given enough memory to create print-resolution PDF files. If you open one of your corrupted PDF files in a text editor it will say something like this:

Fatal error: Out of memory (allocated 31981568) (tried to allocate 456135 bytes) in /some/thing/here/wp-content/plugins/voucherpress/tcpdf/tcpdf.php

Speak to your hosts or system administrator to give PHP more memory. I'm alo working on a way for VoucherPress itself to work around this problem.

Why i the plugin so big? It's over 20 MB!

I know, and I'm sorry, but the TCPDF sytem which generates the PDF documents is pretty big. And there's 40+ default layout templates which aren't small either.

Why did you write this plugin?

I'm not sure. It seemed like a good idea, and gave me opportunity to learn a little bit about the TCPDF class.

Does this plugin work with any e-commerce plugins?

Not at the moment, but I'm sure it could if those e-commerce plugin developers want to get in touch.

Can I add my own codes, for example if I want to give away numbered coupons?

Not at the moment, but I'm thinking about how to make that possible.