재무 및 회계를 위한 AI 기반 송장 알림 및 결제 추적기

• •HTTP Webhook 엔드포인트(n8n이 자동으로 생성)
• •PostgreSQL 데이터베이스 연결 정보
• •OpenAI API Key

{
  "id": "uOMGyPBvAP5ytb64",
  "meta": {
    "instanceId": "dd69efaf8212c74ad206700d104739d3329588a6f3f8381a46a481f34c9cc281",
    "templateCredsSetupCompleted": true
  },
  "name": "AI-Powered Invoice Reminder & Payment Tracker for Finance & Accounting",
  "tags": [],
  "nodes": [
    {
      "id": "5e70b579-3fec-471f-8788-2205c066e21f",
      "name": "일일 확인 예약",
      "type": "n8n-nodes-base.scheduleTrigger",
      "notes": "Runs every day at 9 AM",
      "position": [
        0,
        -304
      ],
      "parameters": {
        "rule": {
          "interval": [
            {
              "field": "cronExpression",
              "expression": "0 9 * * *"
            }
          ]
        }
      },
      "notesInFlow": true,
      "typeVersion": 1.2
    },
    {
      "id": "75c19552-8451-4c27-978c-54d6ea422b84",
      "name": "미결제 송장 가져오기",
      "type": "n8n-nodes-base.postgres",
      "notes": "Query database for unpaid/overdue invoices",
      "position": [
        224,
        -304
      ],
      "parameters": {
        "query": "SELECT \n  invoice_id,\n  client_name,\n  client_email,\n  invoice_number,\n  invoice_amount,\n  currency,\n  issue_date,\n  due_date,\n  payment_status,\n  days_overdue,\n  last_reminder_sent\nFROM invoices \nWHERE payment_status != 'paid' \nAND due_date <= CURRENT_DATE + INTERVAL '7 days'\nORDER BY due_date ASC;",
        "options": {},
        "operation": "executeQuery"
      },
      "credentials": {
        "postgres": {
          "id": "4Y4qEFGqF2krfRHZ",
          "name": "Postgres-test"
        }
      },
      "notesInFlow": true,
      "typeVersion": 2.4
    },
    {
      "id": "3bf276a9-2041-4f5c-995c-ca3ffb4f0cd0",
      "name": "연체 송장 필터링",
      "type": "n8n-nodes-base.if",
      "notes": "Separate overdue from upcoming",
      "position": [
        448,
        -304
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "condition-1",
              "operator": {
                "type": "string",
                "operation": "equals"
              },
              "leftValue": "={{ $json.payment_status }}",
              "rightValue": "unpaid"
            },
            {
              "id": "condition-2",
              "operator": {
                "type": "number",
                "operation": "gte"
              },
              "leftValue": "={{ $json.days_overdue }}",
              "rightValue": 0
            }
          ]
        }
      },
      "notesInFlow": true,
      "typeVersion": 2
    },
    {
      "id": "000ea7a3-3db4-409d-bdea-b416590933e4",
      "name": "알림 로직 계산",
      "type": "n8n-nodes-base.code",
      "notes": "Smart logic for reminder timing",
      "position": [
        672,
        -304
      ],
      "parameters": {
        "jsCode": "const invoices = $input.all();\nconst today = new Date();\nconst results = [];\n\nfor (const invoice of invoices) {\n  const dueDate = new Date(invoice.json.due_date);\n  const issueDate = new Date(invoice.json.issue_date);\n  const lastReminder = invoice.json.last_reminder_sent ? new Date(invoice.json.last_reminder_sent) : null;\n  \n  // Calculate days overdue\n  const daysOverdue = Math.floor((today - dueDate) / (1000 * 60 * 60 * 24));\n  \n  // Calculate days since last reminder\n  const daysSinceReminder = lastReminder ? Math.floor((today - lastReminder) / (1000 * 60 * 60 * 24)) : 999;\n  \n  // Determine reminder type and urgency\n  let reminderType = '';\n  let urgencyLevel = '';\n  let shouldSendReminder = false;\n  \n  if (daysOverdue > 30 && daysSinceReminder >= 3) {\n    reminderType = 'final_notice';\n    urgencyLevel = 'critical';\n    shouldSendReminder = true;\n  } else if (daysOverdue > 14 && daysSinceReminder >= 5) {\n    reminderType = 'second_reminder';\n    urgencyLevel = 'high';\n    shouldSendReminder = true;\n  } else if (daysOverdue > 0 && daysSinceReminder >= 7) {\n    reminderType = 'first_reminder';\n    urgencyLevel = 'medium';\n    shouldSendReminder = true;\n  } else if (daysOverdue === 0) {\n    reminderType = 'due_today';\n    urgencyLevel = 'medium';\n    shouldSendReminder = true;\n  } else if (daysOverdue < 0 && daysOverdue >= -3 && !lastReminder) {\n    reminderType = 'upcoming_reminder';\n    urgencyLevel = 'low';\n    shouldSendReminder = true;\n  }\n  \n  if (shouldSendReminder) {\n    results.push({\n      json: {\n        ...invoice.json,\n        daysOverdue,\n        daysSinceReminder,\n        reminderType,\n        urgencyLevel,\n        shouldSendReminder\n      }\n    });\n  }\n}\n\nreturn results;"
      },
      "notesInFlow": true,
      "typeVersion": 2
    },
    {
      "id": "2879e970-5943-4a87-b74c-dd92e9c83662",
      "name": "AI 프롬프트 준비",
      "type": "n8n-nodes-base.set",
      "position": [
        896,
        -304
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "ai-prompt",
              "name": "aiPrompt",
              "type": "string",
              "value": "=Generate a professional and friendly payment reminder email for the following invoice:\n\nClient Name: {{ $json.client_name }}\nInvoice Number: {{ $json.invoice_number }}\nAmount: {{ $json.currency }} {{ $json.invoice_amount }}\nIssue Date: {{ $json.issue_date }}\nDue Date: {{ $json.due_date }}\nDays Overdue: {{ $json.daysOverdue }}\nReminder Type: {{ $json.reminderType }}\nUrgency: {{ $json.urgencyLevel }}\n\nThe email should:\n- Be courteous and professional\n- Clearly state the outstanding amount and invoice details\n- Mention the due date and overdue status if applicable\n- Include a polite call-to-action for payment\n- Provide payment instructions or link\n- Be appropriately urgent based on the reminder type\n- End with a professional signature\n\nFormat the response as a complete email with subject line."
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "5e61c6ea-62df-4c69-95d8-5b5dd7a0eb66",
      "name": "이메일 형식 지정",
      "type": "n8n-nodes-base.code",
      "notes": "Format email with HTML styling",
      "position": [
        1472,
        -304
      ],
      "parameters": {
        "jsCode": "const items = $input.all();\nconst results = [];\n\nfor (const item of items) {\n  const aiResponse = item.json.message?.content || item.json.response || '';\n  \n  // Extract subject and body from AI response\n  const subjectMatch = aiResponse.match(/Subject:(.+?)\\n/i);\n  const subject = subjectMatch ? subjectMatch[1].trim() : `Payment Reminder - Invoice ${item.json.invoice_number}`;\n  \n  // Remove subject line from body\n  let body = aiResponse.replace(/Subject:(.+?)\\n/i, '').trim();\n  \n  // Add invoice details table\n  const invoiceTable = `\n  <div style=\"background-color: #f5f5f5; padding: 20px; border-radius: 8px; margin: 20px 0;\">\n    <h3 style=\"color: #333; margin-top: 0;\">Invoice Details</h3>\n    <table style=\"width: 100%; border-collapse: collapse;\">\n      <tr>\n        <td style=\"padding: 8px; font-weight: bold;\">Invoice Number:</td>\n        <td style=\"padding: 8px;\">${item.json.invoice_number}</td>\n      </tr>\n      <tr>\n        <td style=\"padding: 8px; font-weight: bold;\">Amount:</td>\n        <td style=\"padding: 8px;\">${item.json.currency} ${item.json.invoice_amount}</td>\n      </tr>\n      <tr>\n        <td style=\"padding: 8px; font-weight: bold;\">Due Date:</td>\n        <td style=\"padding: 8px;\">${item.json.due_date}</td>\n      </tr>\n      <tr>\n        <td style=\"padding: 8px; font-weight: bold;\">Status:</td>\n        <td style=\"padding: 8px; color: ${item.json.daysOverdue > 0 ? '#d32f2f' : '#f57c00'};\">\n          ${item.json.daysOverdue > 0 ? `Overdue by ${item.json.daysOverdue} days` : 'Due Soon'}\n        </td>\n      </tr>\n    </table>\n  </div>\n  `;\n  \n  // Convert body to HTML format\n  body = body.replace(/\\n/g, '<br>').replace(/\\*\\*(.+?)\\*\\*/g, '<strong>$1</strong>');\n  \n  // Combine into HTML email\n  const htmlBody = `\n  <html>\n    <body style=\"font-family: Arial, sans-serif; line-height: 1.6; color: #333;\">\n      ${body.split('<br>')[0]}\n      ${invoiceTable}\n      ${body.split('<br>').slice(1).join('<br>')}\n      <div style=\"margin-top: 30px; padding-top: 20px; border-top: 1px solid #ddd; font-size: 12px; color: #666;\">\n        <p>This is an automated reminder. If you have already made the payment, please disregard this email.</p>\n      </div>\n    </body>\n  </html>\n  `;\n  \n  results.push({\n    json: {\n      ...item.json,\n      emailSubject: subject,\n      emailBody: htmlBody,\n      emailBodyPlain: body.replace(/<[^>]*>/g, '')\n    }\n  });\n}\n\nreturn results;"
      },
      "notesInFlow": true,
      "typeVersion": 2
    },
    {
      "id": "49d9b854-ffda-4125-b07f-9997b799d5aa",
      "name": "이메일 알림 전송",
      "type": "n8n-nodes-base.emailSend",
      "notes": "Send the reminder email",
      "position": [
        1696,
        -304
      ],
      "webhookId": "b74f682a-e6cc-452f-b8ba-2d4390c6e61a",
      "parameters": {
        "options": {
          "appendAttribution": false,
          "allowUnauthorizedCerts": false
        },
        "subject": "={{ $json.emailSubject }}",
        "toEmail": "abc@gmail.com",
        "fromEmail": "xyz@gmail.com"
      },
      "credentials": {
        "smtp": {
          "id": "G1kyF8cSWTZ4vouN",
          "name": "SMTP -test"
        }
      },
      "notesInFlow": true,
      "typeVersion": 2.1
    },
    {
      "id": "6f307b3e-9222-4df7-a92b-9c7dbcea6d79",
      "name": "알림 상태 업데이트",
      "type": "n8n-nodes-base.postgres",
      "notes": "Log reminder sent in database",
      "position": [
        1920,
        -304
      ],
      "parameters": {
        "query": "=UPDATE invoices \nSET \n  last_reminder_sent = CURRENT_TIMESTAMP,\n  reminder_count = reminder_count + 1,\n  last_reminder_type = '{{ $json.reminderType }}'\nWHERE invoice_id = '{{ $json.invoice_id }}';",
        "options": {},
        "operation": "executeQuery"
      },
      "credentials": {
        "postgres": {
          "id": "4Y4qEFGqF2krfRHZ",
          "name": "Postgres-test"
        }
      },
      "notesInFlow": true,
      "typeVersion": 2.4
    },
    {
      "id": "07f23377-e924-49b1-b803-88aedd3de5bd",
      "name": "활동 로그 생성",
      "type": "n8n-nodes-base.set",
      "position": [
        2144,
        -304
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "log-entry",
              "name": "logEntry",
              "type": "object",
              "value": "={\n  \"timestamp\": \"{{ $now.toISO() }}\",\n  \"invoice_id\": \"{{ $json.invoice_id }}\",\n  \"invoice_number\": \"{{ $json.invoice_number }}\",\n  \"client_name\": \"{{ $json.client_name }}\",\n  \"client_email\": \"{{ $json.client_email }}\",\n  \"amount\": \"{{ $json.invoice_amount }}\",\n  \"reminder_type\": \"{{ $json.reminderType }}\",\n  \"urgency_level\": \"{{ $json.urgencyLevel }}\",\n  \"days_overdue\": {{ $json.daysOverdue }},\n  \"status\": \"reminder_sent\"\n}"
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "5884f963-de92-4613-ab16-5fc5bff620cd",
      "name": "활동 로그에 저장",
      "type": "n8n-nodes-base.postgres",
      "position": [
        2368,
        -304
      ],
      "parameters": {
        "table": {
          "__rl": true,
          "mode": "list",
          "value": "invoice_activity_log"
        },
        "schema": {
          "__rl": true,
          "mode": "list",
          "value": "public"
        },
        "columns": {
          "value": {},
          "schema": [],
          "mappingMode": "autoMapInputData",
          "matchingColumns": []
        },
        "options": {}
      },
      "credentials": {
        "postgres": {
          "id": "4Y4qEFGqF2krfRHZ",
          "name": "Postgres-test"
        }
      },
      "typeVersion": 2.4
    },
    {
      "id": "473efd7a-44f7-4724-a638-731e337e21e2",
      "name": "일일 요약 생성",
      "type": "n8n-nodes-base.code",
      "notes": "Create summary report",
      "position": [
        2592,
        -304
      ],
      "parameters": {
        "jsCode": "const allItems = $input.all();\nconst summary = {\n  totalReminders: allItems.length,\n  byUrgency: {},\n  byType: {},\n  totalAmountOutstanding: 0,\n  clients: []\n};\n\nfor (const item of allItems) {\n  // Count by urgency\n  summary.byUrgency[item.json.urgencyLevel] = (summary.byUrgency[item.json.urgencyLevel] || 0) + 1;\n  \n  // Count by type\n  summary.byType[item.json.reminderType] = (summary.byType[item.json.reminderType] || 0) + 1;\n  \n  // Sum outstanding amounts\n  summary.totalAmountOutstanding += parseFloat(item.json.invoice_amount);\n  \n  // Collect client info\n  summary.clients.push({\n    name: item.json.client_name,\n    invoice: item.json.invoice_number,\n    amount: item.json.invoice_amount,\n    daysOverdue: item.json.daysOverdue,\n    urgency: item.json.urgencyLevel\n  });\n}\n\nreturn [{ json: summary }];"
      },
      "notesInFlow": true,
      "typeVersion": 2
    },
    {
      "id": "6a8c062f-093c-40cd-869f-e459ea3b0eac",
      "name": "재무팀에 요약 전송",
      "type": "n8n-nodes-base.emailSend",
      "position": [
        2816,
        -304
      ],
      "webhookId": "ed662db6-84a8-4c6c-bef4-2ac72009a056",
      "parameters": {
        "options": {},
        "subject": "=Daily Invoice Reminder Report - {{ $now.toFormat('yyyy-MM-dd') }}",
        "toEmail": "abc@gmail.com",
        "fromEmail": "xyz@gmail.com"
      },
      "credentials": {
        "smtp": {
          "id": "G1kyF8cSWTZ4vouN",
          "name": "SMTP -test"
        }
      },
      "typeVersion": 2.1
    },
    {
      "id": "29cc7161-00b3-4ad6-8df4-e582296fc2ed",
      "name": "Webhook: 결제 수신",
      "type": "n8n-nodes-base.webhook",
      "notes": "Trigger when payment is received",
      "position": [
        -48,
        368
      ],
      "webhookId": "invoice-payment-webhook",
      "parameters": {
        "path": "invoice-paid",
        "options": {},
        "httpMethod": "POST",
        "responseMode": "responseNode"
      },
      "notesInFlow": true,
      "typeVersion": 2
    },
    {
      "id": "7338b886-106f-4aad-86b7-dd4cb743d8d1",
      "name": "결제 상태 업데이트",
      "type": "n8n-nodes-base.postgres",
      "position": [
        208,
        368
      ],
      "parameters": {
        "query": "=UPDATE invoices \nSET \n  payment_status = 'paid',\n  payment_date = CURRENT_TIMESTAMP,\n  payment_amount = {{ $json.body.amount }},\n  payment_method = '{{ $json.body.payment_method }}'\nWHERE invoice_number = '{{ $json.body.invoice_number }}'\nRETURNING *;",
        "options": {},
        "operation": "executeQuery"
      },
      "credentials": {
        "postgres": {
          "id": "4Y4qEFGqF2krfRHZ",
          "name": "Postgres-test"
        }
      },
      "typeVersion": 2.4
    },
    {
      "id": "f1699fe0-c7fe-48f7-9e39-62e983a7b063",
      "name": "Webhook 응답",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        464,
        144
      ],
      "parameters": {
        "options": {},
        "respondWith": "json",
        "responseBody": "={\n  \"success\": true,\n  \"message\": \"Payment recorded successfully\",\n  \"invoice_number\": \"{{ $json.invoice_number }}\",\n  \"amount_paid\": {{ $json.payment_amount }},\n  \"status\": \"{{ $json.payment_status }}\"\n}"
      },
      "typeVersion": 1.1
    },
    {
      "id": "5554a9a8-1fc3-4743-9f98-896ae8a2b146",
      "name": "결제 확인 전송",
      "type": "n8n-nodes-base.emailSend",
      "position": [
        480,
        576
      ],
      "webhookId": "11ecce72-7466-43e6-8c05-d5f181c5ced7",
      "parameters": {
        "options": {},
        "subject": "=Payment Confirmation - Invoice {{ $json.invoice_number }}",
        "toEmail": "abc@gmail.com",
        "fromEmail": "xyz@gmail.com"
      },
      "credentials": {
        "smtp": {
          "id": "G1kyF8cSWTZ4vouN",
          "name": "SMTP -test"
        }
      },
      "typeVersion": 2.1
    },
    {
      "id": "8a45b060-fd84-4e2f-a880-5bb2db6e5cb4",
      "name": "이메일 생성",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "notes": "Use AI to generate personalized email",
      "position": [
        1200,
        -80
      ],
      "parameters": {
        "model": "=gpt-4o-mini",
        "options": {
          "maxTokens": 500,
          "temperature": 0.7
        }
      },
      "credentials": {
        "openAiApi": {
          "id": "CDQ16eImh6D4tY15",
          "name": "OpenAi account 2 - test"
        }
      },
      "notesInFlow": true,
      "typeVersion": 1
    },
    {
      "id": "51c1516e-e53b-4435-ab0f-a8c147b3478a",
      "name": "이메일 콘텐츠 생성용 AI 에이전트",
      "type": "@n8n/n8n-nodes-langchain.agent",
      "position": [
        1120,
        -304
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 2.2
    },
    {
      "id": "278e2272-baa8-4c0e-81db-836db7204219",
      "name": "스티키 노트1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -32,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Starts the workflow automatically each morning."
      },
      "typeVersion": 1
    },
    {
      "id": "77598975-6120-472e-b9a1-d1b23c64f651",
      "name": "스티키 노트",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        640,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Decides when and how to send reminders.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "98bbe714-19b0-4be2-8610-95074be891e8",
      "name": "스티키 노트2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        416,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Keeps only overdue invoices.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "d4b28ef6-da2a-4d6a-8486-5cb60c272115",
      "name": "스티키 노트3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        192,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Gets unpaid invoices from the database.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "7789557b-f95a-4336-ae2a-2247b215cc6e",
      "name": "스티키 노트4",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        864,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Creates a personalized AI prompt for each client.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "9e5d7552-ab77-48bd-9f64-78a82f9676b1",
      "name": "스티키 노트5",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        2096,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Records reminder activity for audit.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "63b897b8-e59e-42c4-9d3f-194c52c850e6",
      "name": "스티키 노트6",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1872,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Marks reminder as sent in the database.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "9ea47eb5-9b59-47df-873f-1f1060ae9bf5",
      "name": "스티키 노트7",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1648,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
        "content": "Sends the email via Gmail or SMTP.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "9e881563-1895-40a0-8b1b-9f8fe886e284",
      "name": "스티키 노트8",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1424,
        -416
      ],
      "parameters": {
        "width": 192,
        "height": 288,
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