Skip to main content

Documentation Index

Fetch the complete documentation index at: https://docs.mrdn.finance/llms.txt

Use this file to discover all available pages before exploring further.

​
Overview

The refund service generates permanent, cryptographically-verifiable receipts when transactions are refunded. Merchants pay for receipt storage using x402.

​
Refund Process

When a merchant refunds a transaction:
  1. Refund executed on-chain
  2. Receipt generated with transaction details
  3. Merchant pays for permanent IPFS storage
  4. Receipt hash logged to Meridian database
  5. Receipt retrievable by transaction ID or IPFS hash

​
Receipt Contents

  • Original transaction hash
  • Refund transaction hash
  • Amount refunded
  • Currency and network
  • Merchant wallet address
  • Customer wallet address
  • Timestamp
  • Block explorer link
Refund receipt details

​
Example Receipt

{
  "transactionId": "pmt_abc123xyz",
  "originalTxHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
  "refundTxHash": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
  "amount": "10.50",
  "currency": "USDC",
  "network": "base",
  "refundedTo": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "refundedBy": "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199",
  "refundedAt": "2026-01-22T10:30:00.000Z",
  "explorerUrl": "https://basescan.org/tx/0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
  "type": "meridian_refund_receipt",
  "version": "1.0"
}

​
Merchant-Paid Storage

Receipts use x402 protocol via Pinata on Base mainnet. Merchants pay ~$0.001 to permanently store refund proof. Why merchant-paid: Ensures receipts remain accessible indefinitely without platform dependency. Customers receive permanent proof of refund. Pricing: $0.10/GB/month × 12 months = $1.20/GB total Network: Base (x402 protocol requirement)

​
Networks

Refunds can be processed on all Meridian-supported networks: Mainnet: Base, Optimism, Polygon, Unichain, Ink Testnet: Base Sepolia, Optimism Sepolia Merchants need USDC on Base to pay for receipt storage via Pinata x402, regardless of which network the original transaction occurred on.