ARIBA Integration

Does the SAP S/4HANA integrates with the ARIBA network?

Yes, in the cloud with the additional SAP Business Networks and also on premise:

http://diginomica.com/2015/04/16/concur-and-ariba-firm-up-sap-business-networks-story/

PLAN, BUY and PAY with SAP Ariba - YouTube

Ariba IoT to Order with Hana Cloud Platform - YouTube

SAP Ariba Guided Buying (4min) - YouTube  new ARIBA UX

For details on Ariba Network Integration for SAP ERP: Mapping Documentation, please see OSS note 1918732

Also, SAP provides RDS (Rapid Deployment Solutions) to connect SAP software securely and reliably to the ARIBA Network and benefit from preconfigured integration for procure to pay process and best practices for Ariba Procurement Content integration.

• Secure connectivity between SAP NetWeaver Process Orchestration software and the Ariba Business Network
• Ariba Network Adapter
• Data mappings for procure-to-pay process to the cXML format needed for the Ariba Network
• Business Suite (MM or SRM) integration with the Ariba Procurement Content

https://websmp210.sap-ag.de/rds-ariba