Is there any available plugins available in Appian to connect with Workday ERP platform?
If not, can we leverage OOTB integration service for SOAP/REST API based service call?
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At this time, there's not any Appian engineered product integration branded specifically for use with Workday.
That said, you should give it a try with standard Appian configuration options available today.
* To send a request from Appian to a Workday REST API, review the docs on Appian Integration Objects.* To send a request from Appian to a Workday SOAP web service, the Call Web Service Smart service is an option.https://docs.appian.com/suite/help/20.1/Choosing_the_Right_Type_of_Integration.html