Buyer guide
AP approval workflow software
Which of 8 AP automation vendors publish custom approval routing, mobile approvals, and Slack/Teams approvals: sourced, dated, and what to test.
Page reviewed September 30, 2026. Claim-level verification dates appear beside each sourced fact.
Which AP automation software supports custom approval workflows?
7 of the 8 vendors researched publish configurable approval routing: BILL, Ramp, Tipalti, Stampli, Melio, Yooz, and Corpay. BILL, Ramp, Stampli, and Yooz publish mobile approvals. None has a medium- or high-confidence Slack or Microsoft Teams approval claim (BILL's Slack reference is low-confidence). Routing itself is common, so test how each product's rules handle your approval matrix, delegation, and exceptions.
Approval workflow requirements usually come down to three questions: can routing be customized to your org chart, can approvers act from a phone, and does it reach approvers where they already work (Slack/Teams/email).
Sourced comparison
| Dimension | BILL | Ramp | Tipalti | Stampli | Melio | AvidXchange | Yooz | Corpay |
|---|---|---|---|---|---|---|---|---|
| Custom approval routing | Configurable multi-step approval rules, roles, and routing source, verified 2026-09-07 | Custom routing by amount, department, vendor type, and business rules; role-based permissions source, verified 2026-09-07 | Intelligent approval routing based on historical data and company rules source, verified 2026-09-07 | Configurable approval workflows routing to appropriate owners source, verified 2026-09-07 | Multi-level approvals by team member, role, payment amount, and vendor source, verified 2026-09-07 | Approvals are part of the automated AP workflow (routing detail not specified) source, verified 2026-09-07 | Dynamic routing, exception handling, and customized predefined rules source, verified 2026-09-07 | Customizable approval routing and automation source, verified 2026-09-07 |
| Mobile approvals | Mobile approvals supported source, verified 2026-09-07 | Mobile approval capability source, verified 2026-09-07 | UNKNOWN — not independently verified | Mobile access for approvals source, verified 2026-09-07 | UNKNOWN — not independently verified | UNKNOWN — not independently verified | Mobile approval portal for managers source, verified 2026-09-07 | UNKNOWN — not independently verified |
| Slack / Teams approvals | Slack integration referenced as available source, verified 2026-09-07 | UNKNOWN — not independently verified | UNKNOWN — not independently verified | UNKNOWN — not independently verified | UNKNOWN — not independently verified | UNKNOWN — not independently verified | UNKNOWN — not independently verified | UNKNOWN — not independently verified |
Frequently asked questions
What should an AP approval workflow handle?
Routing by amount, department, entity, vendor, and GL account; delegation when an approver is away; escalation when an approval stalls; and an audit trail of who approved what. Test each with your own approval matrix.
Can approvers approve invoices from their phone?
BILL, Ramp, Stampli, and Yooz publish mobile approvals. For Tipalti, Melio, AvidXchange, and Corpay, no verified mobile-approval evidence was found.
Use a comparable evaluation brief
Document accounting system, invoice volume, entity and currency needs, PO matching, approvals, OCR, payments, vendor onboarding, company size, and implementation budget.
Related guides
- How invoice processing automation works
- Best AP automation software compared
- AP software finder
- AP Vendor Evaluation Kit