I have couple of questions on integrating WebMethods IO with S4Hana.

In on-premises where we can create RFC connections to send /receive idocs (sap listener, listener notifications) or call RFC's or Bapi's. 

Do we have an option in WebMethods IO to create RFC connections? if RFC option is not present what are the other options? 

Iam looking for webmethods IO , not webmethods onprimise.

In addition to the OData connector, there is a SAP ERP connector that supports RFC (bidirectional).

Looks like it is not enabled by default. Docs say "SAP® ERP listeners are available upon request for a tenant. Contact IBM support."

Usage for calling RFCs and listening for RFC calls is described on the Listener page

https://docs.webmethods.io/saas/webmethods-integration/events/listeners/index.html

You would also need some type of Internet facing firewall+SAProuter or the webMethods Private Links feature in order for webMethods.io to reach your SAP servers

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Dave Laycock
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SAP ERP connector will be available only for the paid tenants upon request. This will NOT be available to the trial tenants.