# Developer Documentation

**COI tracking and insurance compliance, fully programmable**  
The Billy API lets you automate certificate of insurance (COI) tracking, vendor compliance, and requirement management from any system: your ERP, project management platform, or custom application. Conventional HTTP, JSON in and out, RESTful design.

## Vendor Compliance Reporting: The 13 Reports That Protect Contractors From Risk  
Every general contractor knows the feeling. A subcontractor gets hurt on site, a claim gets filed, and suddenly everyone is asking the same question: was that vendor insured, and can you prove it? Vendor compliance reporting is critical in protecting your business.

## Subcontractor Prequalification in Procore: Complete Vendor Risk Workflow  
From the moment a vendor applies to the day they get paid: how to run prequalification, bidding, and compliance in one place instead of five. If you’re a general contractor, this seamless workflow is essential for managing risk effectively.

## AI COI Review vs. Human Review: What AI Catches, What It Misses, and Why You Need Both  
Every COI platform claims AI-powered review. Here’s what AI genuinely does well, where it still falls short, and why the best construction compliance programs combine both.

## How to Manage Your Outbound COIs as a Subcontractor (The Insurance Wallet Guide)  
Every GC asks for your COI — often repeatedly and urgently. Here’s how to manage your outbound certificates efficiently, and how Billy’s free Insurance Wallet makes the whole thing a one-time setup.

## COI Tracking in Excel: When the Spreadsheet Works and When It Breaks  
Excel works for COI tracking at small scale and breaks predictably at larger ones. Here’s exactly where it fails, what it costs, and the 5 signals you’ve outgrown the spreadsheet — plus a free template.

## How to Fill Out a W9 Form for Subcontractors (Step-by-Step)  
A W9 is required for every subcontractor you pay over $600 per year. Here’s exactly how to fill it out, what errors to avoid, and how to collect W9s at scale without manual follow-up.

## Primary and Non-Contributory Insurance: What It Means and How to Verify It  
Primary and non-contributory language determines which insurance pays first — and most GCs accept COIs without confirming PNC is in the policy. Here’s what it means and how to verify it.

## CG 20 37: Why Completed Operations Coverage Is the Endorsement GCs Forget  
CG 20 10 ends when work stops. CG 20 37 covers you after the subcontractor leaves the site — and most GCs forget to require it. Here’s why it matters and how to verify it.

## Autodesk COI Compliance: What Autodesk Construction Cloud Doesn’t Handle  
Autodesk Construction Cloud connects your project data, but COI collection, endorsement review, and renewal automation sit outside ACC’s scope. Here’s how Billy fills every gap.

## 5 Best CertFocus Alternatives 2026  
If you’ve outgrown CertFocus or you’re evaluating modern replacements, here are the top alternatives — with honest guidance on who each one is actually built for.

## 7 Best Project Compliance Tracking Software Tools (2026)  
Managing compliance across 20+ active projects and 200+ vendors breaks any spreadsheet-and-email workflow. BillyInsurance is the only platform that tracks COIs, W9s, business licenses, and surety bonds in one system — with bi-directional Procore and accounting integrations. Best fit: GCs, developers, and compliance officers.

## 5 Best Compliance Depot Alternatives 2026  
If you’ve outgrown Compliance Depot or you’re evaluating modern replacements, here are the top alternatives — with honest guidance on who each one is actually built for.