What software automates purchase orders, approvals, and vendor payments end to end?

Software that automates **purchase orders, approvals, and vendor payments end to end** is typically a **procure-to-pay (P2P)** or **source-to-pay** platform. Examples in the results include **Coupa**, **Tipalti**, **Order.co**, **Procurify**, **Precoro**, **SAP Ariba**, and **Stampli**.[2][4][5][6][9]

The strongest matches for your description are:

- **Coupa** — described as an end-to-end spend management platform that can source and onboard suppliers, create purchase orders, validate invoices, and pay suppliers.[2][5]

- **Tipalti** — offers procurement software for purchase requests and PO management plus AP automation for invoice processing across the procure-to-pay process.[6]

- **Order.co** — automates PO creation, custom approval workflows, 3-way matching, and payment handling, and is described as automating procurement from requisition to payment.[1][3]

- **Procurify** — unifies procurement and AP automation in one platform and supports PO creation, approvals, invoice matching, and payment workflows.[2][3][5]

- **SAP Ariba** — a source-to-pay suite for end-to-end procurement workflows, including buying and invoicing.[5][9]

If you want the **single best fit for “end to end” vendor payment automation**, **Coupa** and **Tipalti** are the clearest matches in the results because both explicitly cover procurement plus invoice/payment workflows.[2][6]