{
  "name": "Safe refund with outcome contract",
  "nodes": [
    {
      "id": "webhook",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "parameters": { "authentication": "headerAuth", "path": "refund" },
      "credentials": { "httpHeaderAuth": { "id": "credential-reference", "name": "Webhook Header Auth" } }
    },
    {
      "id": "idempotency",
      "name": "Claim idempotency event",
      "type": "n8n-nodes-base.postgres",
      "parameters": {
        "operation": "executeQuery",
        "query": "INSERT INTO event_ledger (event_id) VALUES ($1) ON CONFLICT (event_id) DO NOTHING RETURNING event_id"
      }
    },
    {
      "id": "audit",
      "name": "Record refund audit",
      "type": "n8n-nodes-base.postgres",
      "parameters": { "operation": "insert", "table": "refund_audit" }
    },
    {
      "id": "approval",
      "name": "Approve refund",
      "type": "n8n-nodes-base.if",
      "parameters": { "conditions": { "boolean": [{ "value1": "={{ $json.approved }}", "value2": true }] } }
    },
    {
      "id": "amount",
      "name": "Limit refund amount",
      "type": "n8n-nodes-base.if",
      "parameters": {
        "conditions": { "number": [{ "value1": "={{ $json.amount }}", "operation": "smallerEqual", "value2": 500 }] },
        "currency": "USD"
      }
    },
    {
      "id": "counterparty",
      "name": "Allow refund account",
      "type": "n8n-nodes-base.switch",
      "parameters": { "value": "={{ $json.counterparty }}", "rules": [{ "value": "merchant-primary" }] }
    },
    {
      "id": "refund",
      "name": "Issue refund",
      "type": "n8n-nodes-base.httpRequest",
      "onError": "continueErrorOutput",
      "parameters": { "method": "POST", "url": "https://payments.invalid/refund" }
    },
    {
      "id": "failure-alert",
      "name": "Notify refund failure",
      "type": "n8n-nodes-base.slack",
      "parameters": { "channel": "operations", "text": "Notify failure for refund {{ $json.event_id }}" }
    },
    {
      "id": "compensation",
      "name": "Compensate transaction",
      "type": "n8n-nodes-base.httpRequest",
      "parameters": { "method": "POST", "url": "https://payments.invalid/reverse", "operation": "compensate" }
    }
  ],
  "connections": {
    "Webhook": { "main": [[{ "node": "Claim idempotency event", "type": "main", "index": 0 }]] },
    "Claim idempotency event": { "main": [[{ "node": "Record refund audit", "type": "main", "index": 0 }]] },
    "Record refund audit": { "main": [[{ "node": "Approve refund", "type": "main", "index": 0 }]] },
    "Approve refund": { "main": [[{ "node": "Limit refund amount", "type": "main", "index": 0 }], []] },
    "Limit refund amount": { "main": [[{ "node": "Allow refund account", "type": "main", "index": 0 }], []] },
    "Allow refund account": { "main": [[{ "node": "Issue refund", "type": "main", "index": 0 }], []] },
    "Issue refund": {
      "main": [
        [],
        [
          { "node": "Notify refund failure", "type": "main", "index": 0 },
          { "node": "Compensate transaction", "type": "main", "index": 0 }
        ]
      ]
    }
  },
  "settings": { "executionTimeout": 120, "errorWorkflow": "global-error-handler" }
}