Susan:
There is no good solution for paying US vendors. I've been doing the payments manually through TelPay for Business and the doing manual cheques to get the invoices out of Adagio, but I only have a CAD account. In this manner TelPay sends the vendor a payment advice.
TelPay cannot work with a USD account. For clients with higher volume and/or paying from a USD account we have taken a slightly more streamlined approach that see's PrintBoss being used to email the payment advice and the client entering payments through their online bank account.