Appian SOAP calls

In SAIL: https://docs.appian.com/suite/help/21.3/fnc_scripting_webservicequery.html
In Process model: docs.appian.com/.../Call_Web_Service_Smart_Service.html

Another option could also be to create an integration object with POST method and pass an XML payload. The integration object won't read the WSDL so the endpoint and XML body structure need to be manually retrieved and entered/created