Here are the Endpoints for Soap Webservices. These links also go to the wsdl.
Client
Sandbox: https://sandbox.paymentsgateway.net/WS/Client.svc
Live: https://ws.paymentsgateway.net/Service/v1/Client.svc
Transaction Object
Sandbox: https://sandbox.paymentsgateway.net/WS/Transaction.svc
Live: https://ws.paymentsgateway.net/Service/v1/Transaction.svc
Merchant Object
Sandbox: https://sandbox.paymentsgateway.net/WS/merchant.svc
Live: https://ws.paymentsgateway.net/Service/v1/merchant.svc
AGI Web services
Sandbox https://ws.paymentsgateway.net/pgtest/paymentsgateway.asmx
Live https://ws.paymentsgateway.net/pg/paymentsgateway.asmx