# Developer Documentation

Technical documentation for developers who want to understand, contribute to, or integrate with PolyPay.

## Contents

This section covers:

* [Getting Started](/polypay-docs/developer-documentation/getting-started.md) - Prerequisites, setup, and running the project locally
* [Database Connection Guide](/polypay-docs/developer-documentation/database-connection-guide.md) - How to connect and query the PostgreSQL database
* [Circuit Code Walkthrough](/polypay-docs/developer-documentation/circuit-code-walkthrough.md) - Detailed explanation of the Noir ZK circuit

## Tech Stack

| Component          | Technology                                                            |
| ------------------ | --------------------------------------------------------------------- |
| Frontend           | [Next.js](https://nextjs.org) + [wagmi](https://wagmi.sh)             |
| Backend            | [NestJS](https://nestjs.com) + [Prisma](https://prisma.io)            |
| Smart Contract     | [Solidity](https://soliditylang.org) + [Hardhat](https://hardhat.org) |
| ZK Circuit         | [Noir](https://noir-lang.org)                                         |
| Proof Verification | [zkVerify](https://docs.zkverify.io)                                  |
| Database           | [PostgreSQL](https://www.postgresql.org)                              |

## Supported Networks

| Network | Type    | Chain ID | Explorer                                                                              |
| ------- | ------- | -------- | ------------------------------------------------------------------------------------- |
| Horizen | Mainnet | 26514    | [horizen.calderaexplorer.xyz](https://horizen.calderaexplorer.xyz/)                   |
| Horizen | Testnet | 2651420  | [horizen-testnet.explorer.caldera.xyz](https://horizen-testnet.explorer.caldera.xyz/) |
| Base    | Mainnet | 8453     | [basescan.org](https://basescan.org/)                                                 |
| Base    | Sepolia | 84532    | [sepolia.basescan.org](https://sepolia.basescan.org/)                                 |

## Quick Links

* [GitHub Repository](https://github.com/Poly-pay/polypay_app)
* [Smart Contract on Horizen testnet](https://horizen-testnet.explorer.caldera.xyz/)
* [Smart Contract on Base Sepolia](https://sepolia.basescan.org/)


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