open source registration software

Hi -

A non-proift is wishing to have a "online registration" website for its annual conference.
They would like if possible to offer a credit-card payment option.

Can anyone recommend a good one?
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I used as a payment gateway to my merchant account.  I used their Advanced Integration Method (AIM) to plug the payment piece into my existing site.  
lot more effort than you realize to take CC payments on your site.  First need a CC gateway like authorize net (see above), then you need the coding to link to their interface, and this is several days of coding and testing before it works, then there is $20+ per month for gateway and CC fees even if no orders, then you need CC company applications and sign up with an online authorization merchant.  About 1 month before you are done.  If you don't want the hassle, go with an online payment system linked to a particular website hosting service, that also does all this for you, for a fee, of course.

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