Hi,
I have worked on several payment gateway including KNET, QBMS, EBS. For developing any payment module its API document, merchant Id, password is required. I have experience of building several magento extension. you can check my profile for detailed review. I have worked on many magento extensions. i have been working on magento for last 3 years and all the projects that i have done is on my magento. I have very good communication skills and would be available on skype for discussion.
Best Regards
Sumit