Highlighted Spoke Actions:

Execute Ariba Export Task
Copy Ariba File to Data Source
Execute Ariba Import Task
Create Suppliers
Create Sourcing Project
Update Sourcing Project
Look up PO, PO Lines
Create Receipt
Look up Receipts
Look up Supplier Locations Upstream/Downstream
Import Downstream Supplier
Look up Upstream Suppliers
Look up Fixed Assets
Look up Materials Stream
Look up Payment Terms
Look up Purchase Groups
Create Approval Status
Look up Approval Status
Look up Downstream Approvals
Update Downstream Approval Status
Create Sourcing Event
Create Event Line Items
Create Supplier Invitations
Create Event Questions
Update Event State
Create Award Scenario
Look up Supplier Responses
Create Item Attachments
Look up Event Templates
Look up Supplier Bids
Delete Supplier Invitations
Create Supplier Award
Create Requisition
Update Requisition
Look up Pending Message ID cXML
Look up Invoices cXML
Reject Invoice cXML
Look up Downstream Suppliers Stream
Look up Downstream Remittance Locations Stream

Sample Flows:

Import Supplier Organizations Buyer
Import Supplier Organizations Sourcing

Note that Import Actions are related to ServiceNow creating or updating data in SAP Ariba; Export Actions are related to ServiceNow getting data from SAP Ariba.