Abriba Integration with SAP PI

Dear Experts,

I am SAP PI consultant. currently i am working on integration requirement with ARIBA. where  we need to upload ARIBA Spend Analytic .CSV files  into Ariba. We can achieve this by installing Ariba integration tool in our Landscape. But my client want to use SAP PI as integration tool. Please share your Ideas how can i implement my scenario.

Thanks & Regards,

Pavan