Check Goldcoders script for backdoors!

Hello I have setup a goldcoders script. It processes payments in egold. Goldcoders script is known to have backdoors, that open or activate when payments come inn. I need my script checked and secured for all such, and also against mysql injection. + Max security on my server against any hacks, attacks etc etc. script is coded in zend. You should know how to check it before you bid. Need this help asap. Need a programmer that knows what he is doing. For new people, that dont know what a hyip even is, its no point in posting bids. regards ray