If it's just for accepting US currency, you could try http://worldpay.com.
It's expensive to setup, and they charge about 4.5% of the transaction, and you have to wait a month after the transaction to get your money... but US customers can and do make purchases via it for us (in Australia).
But most will also happily wire the money. We're selling to enterprise customers mainly (banks etc), so it may be a different situation to you. Actually, I suspect the main reason some of our customers prefer credit card is to circumvent internal purchasing procedures.
Have customers told you precisely what their problem is? (or, can you identify them and ask them?) There may be a simpler solution that incorporating in the States (though I've heard that's helpful to being acquired, that doesn't sound like a concern in the present instance).
But most will also happily wire the money. We're selling to enterprise customers mainly (banks etc), so it may be a different situation to you. Actually, I suspect the main reason some of our customers prefer credit card is to circumvent internal purchasing procedures.
Have customers told you precisely what their problem is? (or, can you identify them and ask them?) There may be a simpler solution that incorporating in the States (though I've heard that's helpful to being acquired, that doesn't sound like a concern in the present instance).