S/4HANA Finance - ARIBA Integration

Hi All,

We have a requirement to integrate S/4HANA Finance with Ariba OnDemand. We would like to know the below things

1. List of web services available OOTB for Ariba OnDemand P2P - S/4HANA Finance.
2. Integration Roadmap to know what is being developed on Ariba side as adapters for S/4HANA

Any document or details will be helpful.

Thanks,

Shruthi