> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.duuo.cooperators.ca/prefill-api-guide/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.duuo.cooperators.ca/_mcp/server.

# Prefill API - Guide

## Table of Contents

1. [How Prefill Works](/prefill-api-guide/how-prefill-works)
2. [Authorization](/prefill-api-guide/authorization)
3. [Submit Prefill Data](/prefill-api-guide/submit-prefill-data)
4. [Field Definitions](/prefill-api-guide/field-definitions)
5. [Error Handling](/prefill-api-guide/error-handling)
6. [Environments & Testing](/prefill-api-guide/environments-testing)
7. [Security & Privacy](/prefill-api-guide/security-privacy)
8. [Idempotency, Retries, Timeout, and Limits](/prefill-api-guide/idempotency-retries-timeout-and-limits)
9. [Ownership & Support](/prefill-api-guide/ownership-support)

## Docs

- [Authorization](https://docs.duuo.cooperators.ca/prefill-api-guide.md)
- [How Prefill Works](https://docs.duuo.cooperators.ca/prefill-api-guide/how-prefill-works.md)
- [Authorization](https://docs.duuo.cooperators.ca/prefill-api-guide/authorization.md)
- [Submit Prefill Data](https://docs.duuo.cooperators.ca/prefill-api-guide/submit-prefill-data.md)
- [Field Definitions](https://docs.duuo.cooperators.ca/prefill-api-guide/field-definitions.md)
- [Error Handling](https://docs.duuo.cooperators.ca/prefill-api-guide/error-handling.md)
- [Environments & Testing](https://docs.duuo.cooperators.ca/prefill-api-guide/environments-testing.md)
- [Security & Privacy](https://docs.duuo.cooperators.ca/prefill-api-guide/security-privacy.md)
- [Idempotency, Retries, Timeout, and Limits](https://docs.duuo.cooperators.ca/prefill-api-guide/idempotency-retries-timeout-and-limits.md)
- [Ownership & Support](https://docs.duuo.cooperators.ca/prefill-api-guide/ownership-support.md)

## API Docs

- [Token API](https://docs.duuo.cooperators.ca/prefill-api-guide/authorization/token-api.md): Prefill API - Guide > Authorization
- [Data Transfer API](https://docs.duuo.cooperators.ca/prefill-api-guide/submit-prefill-data/data-transfer-api.md): Prefill API - Guide > Submit Prefill Data

## OpenAPI Specification

- [OpenAPI JSON](https://docs.duuo.cooperators.ca/openapi.json): raw OpenAPI 3.1 specification for this API, JSON format
- [OpenAPI YAML](https://docs.duuo.cooperators.ca/openapi.yaml): raw OpenAPI 3.1 specification for this API, YAML format