Even though your business is not Web hosting, per se, it is a close enough category that it would likely fit into some of the programs and promotions offered by a number of companies here on this forum.
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Check out Corey on here. He resells for Cardservice. He also has another website that allows you to e-mail the invoices to your customers. And then they can go to his site to pay you. I have been beta testing it with some of my corporate clients. I have been extremely pleased with the service and my corporate clients have been very intrigued by it