Depends on what you are going to do with your acct.
Get a processor that will work with your host billing software.
If selling goods then which cart will you be using, and match up the processor with your software,ect.
We also use CDGCommerce. Everything has been working great since the release of Merchant Poral 2.
Also, Authorize.net is only a gateway. I don't think they provide direct merchant services.
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Has anyone used ProPay? Can I have it specify what name is shown on the credit card bill (the business name, of course), or how would that work?
ProPay looks good, because I want to be able to enter the details manually, because I offer domains, SSL certificates, etc. so I want to be able to bill them when they buy them, and not wait for them to do it.