財務・会計向けAI駆動型請求書リマインダーと支払い追跡ツール
上級
これはInvoice Processing, Multimodal AI分野の自動化ワークフローで、35個のノードを含みます。主にIf, Set, Code, Webhook, Postgresなどのノードを使用。 財務・会計業務向けに設計されたAIベースの請求書リマインダーと支払い追跡ツール
前提条件
- •HTTP Webhookエンドポイント（n8nが自動生成）
- •PostgreSQLデータベース接続情報
- •OpenAI API Key
使用ノード (35)
ワークフロープレビュー
ノード接続関係を可視化、ズームとパンをサポート
ワークフローをエクスポート
以下のJSON設定をn8nにインポートして、このワークフローを使用できます
{
"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": "定期チェックのスケジュール",
"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": "未処理請求書の取得",
"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": "期限超過請求書のフィルター",
"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": "リマインダー ロジックの計算",
"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プロンプトの準備",
"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": "メールフォーマットの整形",
"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": "メールリマインダーの送信",
"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": "リマインダー状況の更新",
"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": "アクティビティログの作成",
"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": "アクティビティログへの保存",
"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": "日次サマリーの生成",
"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": "財務チームへサマリーを送信",
"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: Payment Received",
"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": "支払い状況の更新",
"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 Response",
"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": "支払確認の送信",
"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": "メールの生成",
"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": "メール本文生成AIエージェント",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
1120,
-304
],
"parameters": {
"options": {}
},
"typeVersion": 2.2
},
{
"id": "278e2272-baa8-4c0e-81db-836db7204219",
"name": "付箋1",
"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": "付箋",
"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": "付箋2",
"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": "付箋3",
"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": "付箋4",
"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": "付箋5",
"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": "付箋6",
"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": "付箋7",
"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": "付箋8",
"type": "n8n-nodes-base.stickyNote",
"position": [
1424,
-416
],
"parameters": {
"width": 192,
"height": 288,
"content": "Converts AI text to a professional HTML email.\n"
},
"typeVersion": 1
},
{
"id": "1b036318-bfc1-4bef-bde8-06c3523c5ccf",
"name": "付箋9",
"type": "n8n-nodes-base.stickyNote",
"position": [
1104,
-416
],
"parameters": {
"width": 272,
"height": 288,
"content": "Uses AI to draft reminder emails.\n"
},
"typeVersion": 1
},
{
"id": "b570ef63-5ee6-4605-b461-429f1d817b8b",
"name": "付箋10",
"type": "n8n-nodes-base.stickyNote",
"position": [
2544,
-416
],
"parameters": {
"width": 192,
"height": 288,
"content": "Prepares a report of reminders sent.\n"
},
"typeVersion": 1
},
{
"id": "10b172aa-f4bb-4ccc-a102-2593e0d78ff8",
"name": "付箋11",
"type": "n8n-nodes-base.stickyNote",
"position": [
2768,
-416
],
"parameters": {
"width": 192,
"height": 288,
"content": "Emails summary to the finance team.\n"
},
"typeVersion": 1
},
{
"id": "a0c95551-0747-4c97-9cf7-d61ff9c12fd8",
"name": "付箋12",
"type": "n8n-nodes-base.stickyNote",
"position": [
2320,
-416
],
"parameters": {
"width": 192,
"height": 288,
"content": "Stores raw workflow data for review.\n"
},
"typeVersion": 1
},
{
"id": "4e422ead-f833-4de8-8f86-3b78116b2eab",
"name": "付箋13",
"type": "n8n-nodes-base.stickyNote",
"position": [
432,
0
],
"parameters": {
"width": 192,
"height": 288,
"content": "Generates thank-you massage via AI.\n"
},
"typeVersion": 1
},
{
"id": "0816a7b8-03bd-4416-aa58-a30f1e3af0f5",
"name": "付箋14",
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}よくある質問
このワークフローの使い方は？
上記のJSON設定コードをコピーし、n8nインスタンスで新しいワークフローを作成して「JSONからインポート」を選択、設定を貼り付けて認証情報を必要に応じて変更してください。
このワークフローはどんな場面に適していますか？
上級 - 請求書処理, マルチモーダルAI
有料ですか？
このワークフローは完全無料です。ただし、ワークフローで使用するサードパーティサービス（OpenAI APIなど）は別途料金が発生する場合があります。
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ワークフロー情報
難易度
上級
ノード数35
カテゴリー2
ノードタイプ11
作成者
Oneclick AI Squad
@oneclick-aiThe AI Squad Initiative is a pioneering effort to build, automate and scale AI-powered workflows using n8n.io. Our mission is to help individuals and businesses integrate AI agents seamlessly into their daily operations from automating tasks and enhancing productivity to creating innovative, intelligent solutions. We design modular, reusable AI workflow templates that empower creators, developers and teams to supercharge their automation with minimal effort and maximum impact.
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