How do they do it ? would they have contacted each listed merchant, to work something out ? or do they hav a plugin for each site ? or as they say on the site "the merchant tells us what you bought at the end of the month". I am interested in how this works technically, and would really appreciate if some of you helpful guys could help out. Ive been lurking on this forum from time to time for a number of years, this question above has really prompted me to post. I look forward to hearing from you guys. Thanks.