Since Tata Technologies is an Ariba partner, you can access extensive documentation on integration at Ariba Connect. If you do not have access to Connect, submit a New User request from the login screen.
You can also contact the Ariba Partner Support team at SRMCloudEnablement_PartnerSupport@sap.com for further assistance.
SAP Ariba Exchange Community Manager
You can also take advantage of a packaged solution. Here's a link where you can assess the Ariba RDS to see if it's the right fit for your scope and download the package content http://service.sap.com/public/rds-ariba