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

# Introduction

> Integrate Billspree into your application using our REST API.

## Welcome

The Billspree API allows you to automate your billing workflows, manage customers, and track usage programmatically. Our API is built on REST principles and returns JSON-encoded responses.

## Authentication

Generate an API key from your workspace dashboard and send it as the `Authorization` header on every request — no "Bearer" prefix.

```bash theme={null}
Authorization: 60cfb716aa1d0d8d248f324bcfd58da9a889
```