DNN Version 06.02.03; Smith Cart 5.62. Payment Gateway: First Data Connect Web Services
When trying to submit a test cart to FD I immediately receive the following error: Error processing payment. Please try again. FIRSTDATAWS
In the event viewer I have the following warning
Admin Alert - Cart Error: at Smith.Modules.Gateway.SmithDirectGateway.Create(String gatewayCode) at Smith.DNN.Modules.BuyNow.Confirm.Submit() at Smith.DNN.Modules.BuyNow.Confirm.btnSubmit_Click(Object sender, EventArgs e)

When tracing the path through Fiddler it appear the cart is going to payment-sandbox.amazon.com.
I have the certs from FD installed. Any help in resolving this would be appreciated.

Before initiating any effort on Smith's part we did some investigation.
We opened an Authorize.net AIM test account and successfully completed transactions.
We opened a First Data Global Gateway Connect Payplus test account and had success completing a transaction but we encountered a Confirm response URL issue.
We believe our issue with First Data Web Service is with the Client Certificates on our server. We are speaking with our hosting tech support abut the cert installation. 
I will open a new subject about the Response URL issue.