First-Data Payment Gateway Installation Issue

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$30 - $40 USD
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Project Description

I have a website here [url removed, login to view]
Someone installed First Data Payment Gateway and we tested it and everything was working OK but now
it won't work - this might be either a First-Data installation error

When you try to make a payment the form does not respond, earlier it was bringing the warning message saying "headers have already been sent"
I want to work ONLY with people who have dealt with FIRST DATA payment gateway installation.
My budget is fixed but if it takes more work I will pay little extra because I need to get this done before Monday morning


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