Clue on how to program a discount system site like groupon [closed]

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I found this post: programming a contest based on cupon codes in drupal

I wonder if there is any sort of module that does something like http://www.eversave.com/ or http://www.groupon.com;

Does 开发者_如何学编程anybody knows some module(s) that can give me a "head start"?

Maybe a little code clue on how to start?

I really need to make a clone, thanks in advance.

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Please see the modules search on drupal.org related to coupons modules. You can go through them and see which one will suit your needs.

http://drupal.org/search/apachesolr_multisitesearch/coupons?filters=ss_meta_type%3Amodule