Ticketing and invoicing in webshop on wordpress website

Closed - This job posting has been filled and work has been completed.

Job Description

We are selling tickets for our events
With each purchased ticket I would like to send an invoice and ticket with barcode
In addition i would like to work with promo codes
It should look something like this. if I send a promo code that code means you will automatically purchase certain number of tickets for certain price (ex. 10 tickets for 5$ en 20 tickets for 2,5$.)
We have to keep in mind that invoices have numbers and the numbers have to follow. If my some means the payment doesn't get through, no invoices numbers can be skipped.
I would like to have barcode export file for scanner purposes and I would like to have user database where I can e-mail them from my back office.
Platform on which was already built is symphony 2, mysql and php

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