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

# Introduction

> Overview of the D3 Business API for file upload and processing.

# D3 Business API Documentation

Welcome to the **D3 Business API** documentation! This comprehensive guide provides everything you need to integrate D3's powerful file processing capabilities into your applications.

## What's in This Documentation

This documentation goes beyond just API specifications. It provides:

### 📚 **Complete API Reference**

* Detailed endpoint documentation with request/response schemas
* Authentication guidelines
* Error handling and status codes
* Webhook configuration and event payloads

### 🚀 **Getting Started Guides**

* **Quickstart** – Step-by-step tutorial to get you up and running in minutes
* **Authentication** – Learn how to generate and use API keys
* **SDK Documentation** – Official Node.js client library with TypeScript support

### 💡 **Code Examples**

* **Multilingual examples** – Every operation includes both `curl` and Node.js SDK examples
* **Real-world workflows** – Complete end-to-end examples showing file upload, processing, and status checking
* **Best practices** – Recommended patterns for production integrations

### 🔧 **Developer Tools**

* **API Key Management** – Create, manage, and monitor your API keys through the dashboard
* **Webhook Configuration** – Set up async notifications for operation events via the dashboard
* **Usage Analytics** – Track your API usage and quotas in the dashboard

### 📖 **Architecture & Concepts**

* System architecture overview
* File upload flow with presigned URLs
* Operation lifecycle and status tracking
* Webhook delivery and retry mechanisms

## About the D3 Business API

The **D3 Business API** is a high‑throughput, file‑centric API for developers who want to integrate D3's conversion, compression, merge, zip, and PDF utilities directly into their products.

At a high level the system consists of:

* **API Routes** – Entry point for all external requests, applying IP filtering and authentication.
* **Middleware** – API key authentication.
* **External API Handler** – Upload, create operation, fetch status, and other business actions.
* **Service Layer** – Uploads to MinIO, validates file types and ownership, and interfaces with the task system.
* **Repository Layer** – Persists data in Postgres tables such as `developer_app_details`, `external_files`, `external_operations`, and `webhook_logs`.
* **Task System** – Kafka‑powered distributed workers that do the actual file processing.
* **Webhook Service** – Delivers async notifications with retry and HMAC signatures.

## Key Capabilities

* Upload any supported file type to regional MinIO storage.
* Create **operations** such as convert, compress, merge, zip, lock/unlock/reset password.
* Get operation **status** via polling or **webhooks**.
* Manage **API keys** and **webhooks** through the D3 dashboard.

All of these capabilities are exposed via the `/api/v1` Business API surface. API keys and webhooks are managed through the dashboard at [dragdropdo.com/auth/signin](https://dragdropdo.com/auth/signin) in your Account section.

## Next Steps

1. **New to D3?** Start with the [Quickstart](/quickstart) guide
2. **Ready to integrate?** Check out the [Business API Overview](/business-api/overview)
3. **Prefer SDKs?** Explore the [Node.js SDK](/sdks/node) documentation