opencart - Open cart edit checkout functionality -

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i new opencart. want add functionality in open cart site. want create pdf file text , order number after check out process. know it's possible edit check out model , controller files. have doubt lose when upgrade opencart? if there other solution requirement?

please me

you can create function in checkout/order.php model, handle pdf generation operations. before upgrading, can save pdf generator function file keep it.

i can recommend http://dompdf.github.com/ html pdf generator.


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