Procure to pay and purchase to pay refer to the same process. They are simply different names referring to the same thing.
COMPARING P2P AND S2P
Firstly, while the P2P and S2P process are similar in many ways, they also have several differences – the main one that S2P starts one step earlier than P2P, with the sourcing of goods.
The procure to pay process usually begins with the requisition of goods and services and ends when the accounts payable team pays the vendor.
Source to pay goes one step further. With S2P, strategic sourcing becomes part of the process, ensuring that the best vendors are selected, and negotiating deals with them. This helps to optimise internal controls, enhance supply chain efficiency, and simplify vendor relationship management.