How to integrate SAP data with Sharepoint 2013 ?

Hi Experts,

I have a requirement to integrate SAP master data with Sharepoint 2013 as my client want to access all SAP master data through his SharePoint software. I know we can achieve this through ABAP code & some connectivity or web services but don't know the exact process. Where I can write the code to integrate both the system ?

Please let me know the whole process or step by step guide to implement the same. Any valuable suggestion will be rewarded.

Thanks in Advance.