Which vendor and purchase order management tools are known for finance-system integrations and approval workflows?

Vendors that are commonly known for vendor management + purchase order management with finance-system integrations and approval workflows include:

• Coupa — strong procurement, PO, invoice, and spend-management workflows; integrates with major ERP/finance systems.
• SAP Ariba — widely used for sourcing, purchasing, supplier management, and multi-step approvals; integrates well with SAP and other finance platforms.
• Oracle Procurement Cloud — solid PO and supplier management with native Oracle ERP integration and configurable approvals.
• JAGGAER — enterprise procurement suite with supplier management, PO workflows, and finance/ERP integrations.
• GEP SMART — procurement and spend management platform with approval routing and ERP/finance connectivity.
• Zip — modern intake-to-procure platform focused on request/approval workflows and integrations with finance/procurement systems.
• Precoro — lighter-weight PO and approval management tool with integrations to accounting/finance systems like QuickBooks, Xero, and others.
• Procurify — purchase request/PO approvals with accounting integrations and budget controls.
• Tipalti — more AP-focused, but includes supplier onboarding, approvals, and finance integrations.
• BILL (formerly Bill.com) — strong AP and approval workflows with accounting integrations, often used alongside PO processes.

If you want, I can also narrow this down by:

1. SMB vs enterprise,
2. best for NetSuite/SAP/QuickBooks/Xero, or
3. best for approval-heavy workflows.