# March 11, 2026 

** March 11, 2026 Karbon API release adds an early version of a developer quick-reference guide covering authentication, pagination, filtering, and common API workflows. **
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## New Developer Quick-Reference Guide (Early Access)

We've published an early version of `KARBON_API.md`, a concise reference guide for developers and AI agents working with the Karbon API. This is a first cut — we're actively looking to improve it based on real-world usage, and we'd love your feedback in the [Karbon Community](https://community.karbonhq.com/).

The guide is available in the [API specification repository](https://github.com/karbonhq/karbon-api-reference) and currently covers:

- **Authentication** — how to format the `Authorization` and `AccessKey` headers
- **Pagination** — using `$top`, `$skip`, and `@odata.nextLink`
- **Filtering** — supported `$filter` operators and fields per endpoint
- **Ordering and expanding** — `$orderby` and `$expand` options by endpoint
- **Resource quick-reference** — all available endpoints grouped by resource type
- **Key concepts** — `PrimaryStatus` values, fee settings, webhook payloads, and more

### Common Workflows

The guide also includes step-by-step workflows for common integration tasks:

- Onboarding a new client (Contact, Organization, and Work Item creation)
- Pulling timesheet data for active work items
- Creating and assigning custom fields
- Creating a Work Item from a Work Template
- Setting up a monthly repeating Work Schedule
- Subscribing to Invoice webhooks
- Updating contact information via BusinessCards

If something is missing, unclear, or incorrect, let us know in the [Karbon Community](https://community.karbonhq.com/).