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Re:Ask HN: How do you process credit card payments? by bcater on Tuesday May 19, 2009 @01:44PM (#617204)
Authorize.net - http://authorize.net/
Re:Ask HN: How do you process credit card payments? by spooneybarger on Tuesday May 19, 2009 @02:17PM (#617291)
all of the below:

sage pay, transfirst, chase paymentech, streamline