Source to Pay (S2P) refers to the end-to-end procurement process encompassing activities from strategic to transactional. Source to Contract involves the activities of sourcing, negotiating and contracting with a supplier, whilst Procure to Pay refers to the process of raising a Purchase Requisition and Purchase Order through to the payment of the supplier. Managed effectively, Source to Pay can integrate a large proportion of procurement stages into one streamlined workflow, enabling organizations to optimize supplier relationships, control costs, ensure compliance, and achieve greater visibility and efficiency throughout the entire procurement lifecycle.