Addon for Open realty 2.5.8 script - e-coins payment system

Im looking for experienced php/mysql developer for this job. This addon purpose is to introduce e-coins payment system on Open Realty 2.5.8. web site (OR). Agents will be able to buy e-coins with bank payment, credit card payment and SMS payment. Credit card payment and SMS payment should rise their e-coins balance automatically (instant payment notifications.). For bank payment admin will need the „Deposit management screen" for manuall balance management. We need to create 2 scripts to handle [login to view URL] and [login to view URL] instant payment notifications. Only developers with experience in similar jobs, preffered developers familiar with open realty addon system. Be sure to specify which similar jobs are done. Open realty 2.5.8. docs is available on: [login to view URL] , addon part cames at the end of doc. Developer will get access to my dev server (ftp, phpmyadmin, and Open Realty admin access) . I can provide some support with testing. Everything should be templated (no html hardcoding in addon code), so if I upgrade site template, I should be able to use addon with new design as well.