Minimum Asynchronous Requirement

To make an asynchronous API call, identify it as asynchronous using one of these wrappers.

C# Example 

1CreateOptions co = new CreateOptions();
2co.RequestType = RequestType.Asynchronous;
3co.RequestTypeSpecified = true;
4CreateResult[] results = integrationFramework.Create(co, new APIObject[] { sub }, out requestID, out status);

SOAP Envelope 

1<soap:Body>
2    <CreateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
3        <Options>
4            <RequestType>Asynchronous</RequestType>
5        </Options>
6...