# Welcome to Cheqi Developer Documentation

Cheqi is a unified receipt platform with SDKs and APIs that let you generate and deliver digital receipts with minimal integration effort. You focus on creating receipts — Cheqi handles recipient resolution, secure delivery, and downstream integrations.

Building digital receipts is deceptively hard. As a developer you quickly run into the same problems:

- Customer identification (who should receive the receipt?)
- Reliable delivery (app, multiple devices, and fallbacks when the customer isn’t a user yet)
- Security and privacy requirements (you shouldn’t have to store or expose customer data)
- Downstream integrations (accounting/expense tools, webhooks, and verification)


## Quick Links

- **[Receipt Flow Overview](/receipts/overview)** - Learn how receipts are processed end-to-end
- **[Authentication](/authentication/overview)** - API Keys and OAuth 2.0
- **[Java SDK](/sdk/java)** - Integrate Cheqi with Java/Spring Boot
- **[.NET SDK](/sdk/dotnet)** - Integrate Cheqi with C#/.NET
- **[API Reference](/apis/api-docs)** - Full endpoint reference


## Key Features

- **Recipient resolution** - Automatically route receipts to the right person using payment or email signals
- **Reliable delivery** - Deliver to customer apps across all devices, with automatic email fallback when needed
- **Zero-knowledge architecture** - Receipt data is encrypted so only the intended recipients can read it (Cheqi can’t)
- **Privacy by default** - Receipt delivery is designed so sensitive customer data stays protected
- **Webhooks for integrations** - Push receipts to authorized third-party systems (accounting/expense tools)
- **Standardized receipt format** - Generate consistent, UBL-based receipt data for interoperability


## Getting Started

1. **Sign up** in the Cheqi app (download the app first to create your account and business)
2. **Get credentials** (API key or OAuth, depending on your use case)
3. **Install** the SDK for your platform (Java or .NET)
4. **Send identification details** (webshop email and/or payment details from your provider)
5. **Submit receipt data** and let the SDK/flow handle delivery
6. **Optionally subscribe to webhooks** to receive receipts in third-party systems


## Support

- **Email**: support@cheqi.io
- **Documentation**: https://docs.cheqi.io
- **GitHub**: https://github.com/cheqi-io