# Nylas API reference documentation

Source: https://developer.nylas.com/docs/v3/api-references/

This section houses the reference documentation for the Nylas APIs.

## API reference documentation

The Nylas API reference documentation includes:

- [**Administration APIs**](/docs/reference/api/): Documentation for the Applications, Connectors, Connector Credentials, Authentication, Grants, and Webhooks APIs.
- [**Email, Calendar, Contacts, and Notetaker APIs**](/docs/reference/api/): Documentation for the Email, Calendar, Contacts, and Notetaker APIs.
- [**Scheduler APIs**](/docs/reference/api/): Documentation for Scheduler APIs.

## Nylas Postman collection

Nylas maintains a [Postman collection](https://www.postman.com/trynylas/workspace/nylas-api/overview) and related [prose documentation](/docs/v3/api-references/postman/) to guide you through testing the Nylas APIs.

## Webhooks and notification schemas

Nylas uses webhooks to send real-time notifications when events occur. See the [webhooks documentation](/docs/v3/notifications/) to learn how to set up and manage webhooks, and the [notification schemas reference](/docs/reference/notifications/) for the payload format of each notification type.

## Event codes and error types

Nylas maintains a [list of event codes and error types](/docs/api/errors/) you may encounter, and troubleshooting steps for each of them.