After go through your job description, I can assure you that I can integrate your payment gateway as per your requirements and give you quality work .
I am a Senior web developer with lot of experience in Magneto website , extension development , payment gateways expert , theme/plugin customization expert and bug fixing and troubleshooting in many websites.
Plugins/modules i have worked on for Magento are:
1. Fooman Speedster – Speed up your store by combining, compressing and caching JS and CSS.
2. Lazzymonks Google Ads – Adds Google Ads Blocks to the bottom of either the menu
3. Product Gallery Importer – Product Gallery Importer lets you import products with multiple product images from a CSV file.
I speak fluent English with quality communication through Skype and flexible to work in all timezone.
I am new in Freelancer but not in this field;I'm fully IT professional with lot of experience in Development.
So looking forward to hear from you soon.
Thanks.