{
  "name": "Delivery Note OCR",
  "nodes": [
    {
      "parameters": {
        "rule": {
          "interval": [
            {
              "field": "seconds",
              "secondsInterval": 30
            }
          ]
        }
      },
      "id": "uuid-schedule",
      "name": "Poll every 30 s",
      "type": "n8n-nodes-base.scheduleTrigger",
      "typeVersion": 1.3,
      "position": [
        240,
        300
      ],
      "webhookId": ""
    },
    {
      "parameters": {
        "method": "GET",
        "url": "={{ $env.MEGA_PB_URL }}/api/collections/delivery_notes/records",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "filter",
              "value": "=processing_status='pending'"
            },
            {
              "name": "fields",
              "value": "id,delivery_note_number,site,project_code,slip_image,purchase_order,date_received"
            },
            {
              "name": "perPage",
              "value": "20"
            },
            {
              "name": "sort",
              "value": "created"
            }
          ]
        },
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "={{ $credentials.pbToken }}"
            }
          ]
        },
        "options": {}
      },
      "id": "uuid-list",
      "name": "List pending DNs",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.4,
      "position": [
        460,
        300
      ],
      "credentials": {
        "httpHeaderAuth": {
          "id": "REPLACE_PB_TOKEN_ID",
          "name": "PocketBase Admin Token"
        }
      }
    },
    {
      "parameters": {
        "batchSize": 1,
        "options": {}
      },
      "id": "uuid-split",
      "name": "For each pending DN",
      "type": "n8n-nodes-base.splitInBatches",
      "typeVersion": 3,
      "position": [
        680,
        300
      ]
    },
    {
      "parameters": {
        "method": "GET",
        "url": "={{ $env.MEGA_PB_URL }}/api/files/delivery_notes/{{ $json.id }}/{{ $json.slip_image }}",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "={{ $credentials.pbToken }}"
            }
          ]
        },
        "options": {}
      },
      "id": "uuid-download",
      "name": "Download slip image",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.4,
      "position": [
        900,
        300
      ],
      "credentials": {
        "httpHeaderAuth": {
          "id": "REPLACE_PB_TOKEN_ID",
          "name": "PocketBase Admin Token"
        }
      }
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://api.openai.com/v1/chat/completions",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "Bearer {{ $credentials.openaiKey }}"
            },
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={\n  \"model\": \"gpt-4o-mini\",\n  \"response_format\": { \"type\": \"json_object\" },\n  \"messages\": [\n    {\n      \"role\": \"system\",\n      \"content\": \"You are extracting structured data from a delivery note slip image. Return ONLY valid JSON matching this schema: { \\\"type\\\": \\\"object\\\", \\\"properties\\\": { \\\"po_number\\\": { \\\"type\\\": [\\\"string\\\", \\\"null\\\"] }, \\\"delivery_note_number\\\": { \\\"type\\\": [\\\"string\\\", \\\"null\\\"] }, \\\"date_received\\\": { \\\"type\\\": [\\\"string\\\", \\\"null\\\"] }, \\\"received_by_name\\\": { \\\"type\\\": [\\\"string\\\", \\\"null\\\"] }, \\\"confidence\\\": { \\\"type\\\": \\\"number\\\", \\\"minimum\\\": 0, \\\"maximum\\\": 1 }, \\\"items\\\": { \\\"type\\\": \\\"array\\\", \\\"items\\\": { \\\"type\\\": \\\"object\\\", \\\"properties\\\": { \\\"description\\\": { \\\"type\\\": \\\"string\\\" }, \\\"qty\\\": { \\\"type\\\": \\\"number\\\" }, \\\"unit\\\": { \\\"type\\\": [\\\"string\\\", \\\"null\\\"] }, \\\"unit_price\\\": { \\\"type\\\": [\\\"number\\\", \\\"null\\\"] } } } } } }. Rules: confidence is your honest assessment (0.9+ only if everything is clearly legible); quantities must be numbers; if the slip is unreadable return empty items and confidence below 0.3.\"\n    },\n    {\n      \"role\": \"user\",\n      \"content\": [\n        {\n          \"type\": \"text\",\n          \"text\": \"Extract the delivery note data from this slip image.\"\n        },\n        {\n          \"type\": \"image_url\",\n          \"image_url\": { \"url\": \"data:image/jpeg;base64,{{ $binary.data }}\" }\n        }\n      ]\n    }\n  ]\n}",
        "options": {}
      },
      "id": "uuid-ocr",
      "name": "OCR via OpenAI Vision",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.4,
      "position": [
        1120,
        300
      ],
      "credentials": {
        "httpHeaderAuth": {
          "id": "REPLACE_OPENAI_KEY_ID",
          "name": "OpenAI API Key"
        }
      }
    },
    {
      "parameters": {
        "jsCode": "// OpenAI returns { choices: [{ message: { content: \"<json string>\" }] }\nconst raw = $json.choices?.[0]?.message?.content;\nif (!raw) throw new Error('No OCR content in response');\nconst parsed = typeof raw === 'string' ? JSON.parse(raw) : raw;\nreturn [{ json: parsed }];"
      },
      "id": "uuid-parse",
      "name": "Parse OCR JSON",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        1340,
        300
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "={{ $env.MEGA_NEXT_URL }}/api/delivery-notes/{{ $('List pending DNs').item.json.id }}/ocr-result",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "x-ingest-secret",
              "value": "={{ $env.N8N_INGEST_SECRET }}"
            },
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={\n  \"po_number\": {{ $json.po_number ? '\"' + $json.po_number + '\"' : 'null' }},\n  \"delivery_note_number\": {{ $json.delivery_note_number ? '\"' + $json.delivery_note_number + '\"' : 'null' }},\n  \"date_received\": {{ $json.date_received ? '\"' + $json.date_received + '\"' : 'null' }},\n  \"received_by_name\": {{ $json.received_by_name ? '\"' + $json.received_by_name + '\"' : 'null' }},\n  \"confidence\": {{ $json.confidence || 0 }},\n  \"items\": {{ JSON.stringify($json.items || []) }},\n  \"raw_ocr\": null\n}",
        "options": {
          "continueOnFail": true
        }
      },
      "id": "uuid-callback",
      "name": "POST result to app",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.4,
      "position": [
        1560,
        300
      ]
    },
    {
      "parameters": {
        "method": "PATCH",
        "url": "={{ $env.MEGA_PB_URL }}/api/collections/delivery_notes/records/{{ $('List pending DNs').item.json.id }}",
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Authorization",
              "value": "={{ $credentials.pbToken }}"
            },
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={ \"processing_status\": \"ocr-complete\" }",
        "options": {
          "continueOnFail": true
        }
      },
      "id": "uuid-mark",
      "name": "Mark ocr-complete in PB",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.4,
      "position": [
        1780,
        300
      ],
      "credentials": {
        "httpHeaderAuth": {
          "id": "REPLACE_PB_TOKEN_ID",
          "name": "PocketBase Admin Token"
        }
      }
    }
  ],
  "connections": {
    "Poll every 30 s": {
      "main": [
        [
          {
            "node": "List pending DNs",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "List pending DNs": {
      "main": [
        [
          {
            "node": "For each pending DN",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "For each pending DN": {
      "main": [
        [
          {
            "node": "Download slip image",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Download slip image": {
      "main": [
        [
          {
            "node": "OCR via OpenAI Vision",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "OCR via OpenAI Vision": {
      "main": [
        [
          {
            "node": "Parse OCR JSON",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Parse OCR JSON": {
      "main": [
        [
          {
            "node": "POST result to app",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "POST result to app": {
      "main": [
        [
          {
            "node": "Mark ocr-complete in PB",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Mark ocr-complete in PB": {
      "main": [
        [
          {
            "node": "For each pending DN",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1",
    "saveExecutionProgress": true,
    "saveDataSuccessExecution": "all",
    "saveDataErrorExecution": "all",
    "saveManualExecutions": true
  },
  "versionId": "1",
  "id": "delivery-note-ocr",
  "meta": {
    "templateCredsSetupCompleted": false,
    "description": "Polls PocketBase every 30 s for delivery_notes with processing_status='pending', OCRs the slip via OpenAI Vision, and POSTs the result back to /api/delivery-notes/{id}/ocr-result."
  },
  "tags": [
    {
      "name": "ocr"
    },
    {
      "name": "delivery-notes"
    },
    {
      "name": "pocketbase"
    }
  ]
}