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I have extensive experience that meets the qualifications, and would be happy to complete this work for you. We can speak via telephone, skype, yahoo im, aim, msn messenger, or irc chat.
I have dealt with many payment gateway APIs like paypal, authorize.net, sagepay, 2checkout and many more. If it is already developed for your script then I would take hardly 1 day to fix it or if it is not then it could be developed within two days. Please let me know your availability.moreless