Before the Madrid release of ServiceNow, an out of box SOAP integration with Workday was offered. However, with this pre-built integration now deprecated, a lot of customers are still leveraging the old SOAP integration, and new ones stuck with figuring out how to build a new one. Truth be told, the days of SOAP integrations are over. In various ways which I wont dive into here, REST is a far preferred method for building modern SaaS integrations.