Asynchronous Acknowledgement > Implementing Asynchronous Acknowledgement
  
Implementing Asynchronous Acknowledgement
The asynchronous acknowledgement is implemented as a callback Web service named processMessageAcknowledgement that can be invoked by the URL:
http://<host>:<port>/<qxi webapp>/services/QdocWebService
The WSDL is available at
http://<host>:<port>/<qxi webap>/services?wsdl=processMessageAcknowledgement