Source-to-Pay: from sourcing through payment
Source-to-Pay is the full procurement lifecycle — not just the purchase order and the invoice, but everything upstream that determines who you buy from and on what terms. Krayuv is built around this full span, from sourcing and vendor management through to purchasing and payment workflows.
- Sourcing & RFQSealed quotes
- Reverse auctionLive bidding
- Vendor managementKYC verified
- Purchase orderAuto-generated
- 3-way matchingReconciled
- PaymentScheduled
What Source-to-Pay means
Most procurement conversations focus on the purchase order and what happens after — but by the time a PO exists, the supplier has already been chosen, the price has already been negotiated, and most of the opportunity to get a better outcome has already passed. Source-to-Pay (S2P) is the term for the complete process, starting upstream: identifying what's needed, sourcing and evaluating suppliers, running RFQs or competitive auctions, selecting and onboarding a vendor — and only then moving into purchasing and payment.
Treating sourcing and purchasing as one connected process, rather than two disconnected ones handled by different teams in different tools, is what S2P software is built to support.
The Source-to-Pay lifecycle
Sourcing
Identify suppliers and define what you're buying and on what terms.
RFQ
Send a request for quotation to shortlisted suppliers and collect comparable responses.
Reverse auction
Run competitive, real-time bidding among qualified suppliers where it fits the category.
Vendor management
Onboard, qualify, and track the supplier relationship over time — not just for one deal.
Purchasing
Convert the sourcing decision into a purchase requisition and purchase order.
Payment
Match the invoice to the order and complete payment, closing the loop.
Source-to-Pay vs. Procure-to-Pay
These terms get used loosely, but the scope difference is specific and worth being clear about — especially if you're evaluating software against one or the other.
| Source-to-Pay (S2P) | Procure-to-Pay (P2P) | |
|---|---|---|
| Starting point | Identifying a need and finding a supplier | An approved requisition, ready to become a purchase order |
| Covers sourcing & RFQs | Yes — sourcing, RFQ, and supplier selection sit inside S2P | No — P2P assumes sourcing already happened |
| Covers reverse auctions | Yes, where competitive bidding is used during sourcing | No — out of scope for P2P |
| Covers vendor management | Yes — supplier onboarding and relationship management included | Sometimes, in a lighter form (e.g. vendor master data) |
| Ends at | Payment — the full lifecycle | Payment — but starting from requisition, not sourcing |
How Krayuv approaches Source-to-Pay
Krayuv is built around the full sourcing-to-payment span — sourcing and vendor management on one side, purchasing and payment workflows on the other — rather than treating sourcing and purchasing as separate systems. That includes five auction formats and three RFQ workflow types on the sourcing side, and automated 3-way matching on the purchasing side, so an award carries through to a paid, reconciled invoice without re-entry at each handoff.
See how the individual pieces work: RFQ software · Reverse auctions · Vendor management
Frequently asked questions
What is included in Source-to-Pay?
Source-to-Pay (S2P) covers the entire procurement lifecycle: identifying a need, sourcing suppliers, running RFQs and sometimes reverse auctions, selecting and onboarding vendors, raising purchase requisitions and orders, and finally invoicing and payment. It's the broadest end-to-end view of procurement.
What's the difference between S2P and P2P?
Source-to-Pay (S2P) starts at identifying a need and sourcing a supplier — it includes RFQs, competitive bidding, and vendor selection. Procure-to-Pay (P2P) is narrower: it starts once a supplier is already chosen, at the purchase requisition, and covers the PO, invoice matching, and payment. P2P is effectively the downstream half of S2P.
Do I need Source-to-Pay software, or is Procure-to-Pay enough?
If your organization already has strong supplier relationships and mainly needs to control requisitions, approvals, and payments, Procure-to-Pay tools may be sufficient. If sourcing decisions — finding and comparing suppliers, running RFQs or auctions — are themselves a source of inefficiency or lack of transparency, you need Source-to-Pay coverage upstream of the purchase order.
Talk through your sourcing-to-payment process
Book a short call and we'll walk through what's live today, mapped to how your team sources and buys.