We have a requirement to setup SAP single touch payroll by sending SOAP xml data from ECC to SAP Gateway system. SAP gateway system then connects securely to SAP CPI to send the SOAP xml message so that it will be consumend by SAP CPI. Is there any configuration setup document for such design i.e. ECC->Gateway->SAP CPI-->ATO. Issue here is how to send SOAP xml to Gateway and then in turn when ATO sends data back to Gateway this needs to sent to ECC. Is this achievable ? Because i only have SAP standard document which send SOAP xml data directly to ATO. But we want a middleware i.e Gateway. If not Gateway will web-dispatcher work? If web-dispatcher works then is there any standard document for the said connectivity i.e. ECC->Web-dispatcher->SAP CPI-->ATO.