consume SOAP web service
The easiest way is to use .NET's built-in support.
In Visual Studio, right click on your project references and 'Add Service Reference'. Give it the service URL https://www.eway.com.au/gateway/ManagedPaymentService/managedCreditCardPayment.asmx and it will generate a proxy class for you that will do all the work. You can then just e.g.
var client = new eWayServiceReference.managedCreditCardPaymentSoapClient();client.CreateCustomer(...);Alternatively you can generate the proxy class from a VS command prompt using svcutil.