> ## Documentation Index
> Fetch the complete documentation index at: https://docs.incard.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Overview of the Incard Developer API.

The Incard Developer API lets you integrate with company profiles, outbound invoices, payees, and related resources through the **Developer Gateway**.

## Environments

| Environment | Base URL                         |
| ----------- | -------------------------------- |
| Sandbox     | `https://api-nonprod.incard.com` |
| Live        | `https://api.incard.com`         |

Use sandbox while building and testing. Gateway paths are relative to the base URL and use the `/developer/companies/…` prefix — for example `GET /developer/companies`.

## Get started

1. **[Authentication](/guides/authentication)** — create an API key, exchange it for a short-lived access token, and understand role-based permissions.
2. **[Quickstart](/guides/quickstart)** — make your first authenticated request.

Every Developer API call uses `Authorization: Bearer <access_token>`. Do not send your API key on resource endpoints.

## What's in this reference

This site documents a **curated set of endpoints** ready for integrators. The API Reference tab lists each operation with request and response examples.

| Tag          | Resources                                                    |
| ------------ | ------------------------------------------------------------ |
| **company**  | Company profile                                              |
| **invoices** | Outbound invoices (create, list, update, stats, suggestions) |
| **payee**    | Payment recipients                                           |
| **webhooks** | Transaction webhook deliveries (receive and verify)          |