For AI agents: visit https://developer.bill.com/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI.
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System Status
v2
Guides
API Reference
Release Notes
Postman Collection
Video Tutorials
March 20th, 2026
Improved
Webhook API improvements
March 20th, 2026
Improved
Invoices API improvements
March 20th, 2026
Improved
Bills and Invoices API improvements
March 16th, 2026
Added
New webhook for Spend & Expense reimbursements
March 13th, 2026
Improved
Webhook API improvements
February 20th, 2026
Added
New developer tutorial on YouTube
February 18th, 2026
Improved
Vendors API improvements
February 18th, 2026
Improved
Documents API improvements
February 12th, 2026
Improved
BILL widgets release 2026-02-13
February 6th, 2026
Removed
UPCOMING API CHANGES | Use primary MFA phone number
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