Workflow: Unique QRcode coupon assignment and validation for Lead Generation system
Integrations: emailSend, formTrigger, googleSheets, httpRequest, if, respondToWebhook, set, stickyNote, webhook

{"id": "fW6PV9IaePKSMGbN", "meta": {"instanceId": "workflow-38d6fe00", "versionId": "1.0.0", "createdAt": "2025-09-29T07:08:01.429814", "updatedAt": "2025-09-29T07:08:01.429824", "owner": "n8n-user", "license": "MIT", "category": "automation", "status": "active", "priority": "high", "environment": "production"}, "name": "Unique QRcode coupon assignment and validation for Lead Generation system", "tags": ["automation", "n8n", "production-ready", "excellent", "optimized"], "nodes": [{"id": "5ef4dd1d-39d6-487e-a48d-420b458ac1ee", "name": "Webhook", "type": "n8n-nodes-base.webhook", "position": [-420, 340], "webhookId": "bb832325-8c58-4717-b866-41f8a9714cf2", "parameters": {"path": "bb832325-8c58-4717-b866-41f8a9714cf2", "options": {}, "responseMode": "responseNode"}, "typeVersion": 2, "notes": "This webhook node performs automated tasks as part of the workflow."}, {"id": "a7102d60-d4bd-450d-92b3-a32e2304b4a9", "name": "If Node", "type": "n8n-nodes-base.if", "position": [40, 340], "parameters": {"options": {}, "conditions": {"options": {"version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict"}, "combinator": "and", "conditions": [{"id": "430aee2d-a788-4d7c-ab64-880c900f0058", "operator": {"type": "string", "operation": "exists", "singleValue": true}, "leftValue": "={{ $json.qr }}", "rightValue": ""}]}}, "typeVersion": 2.2, "notes": "This if node performs automated tasks as part of the workflow."}, {"id": "f9dfd28e-42b5-488a-acde-dbbff95cf72f", "name": "Token SuiteCRM", "type": "n8n-nodes-base.httpRequest", "position": [700, -320], "parameters": {"url": "{{ $env.BASE_URL }}", "options": {}, "requestMethod": "POST", "bodyParametersUi": {"parameter": [{"name": "grant_type", "value": "client_credentials"}, {"name": "client_id", "value": "CLIENTID"}, {"name": "client_secret", "value": "CLIENTSECRET"}]}, "allowUnauthorizedCerts": true}, "notesInFlow": true, "typeVersion": 1, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "0e5c7208-a90a-4612-a5eb-f962546320dc", "name": "Create Lead SuiteCRM", "type": "n8n-nodes-base.httpRequest", "position": [940, -320], "parameters": {"url": "{{ $env.API_BASE_URL }}", "method": "POST", "options": {"response": {"response": {"responseFormat": "json"}}}, "jsonBody": "={\"data\": \n  {\n  \"type\": \"Leads\",\n  \"attributes\": { \n  \"first_name\": \"{{ $('Form Fields').item.json.Name }}\",\n  \"last_name\": \"{{ $('Form Fields').item.json.Surname }}\",\n  \"email1\": \"{{ $('Form Fields').item.json.Email }}\",\n  \"phone_mobile\":\"{{ $('Form Fields').item.json.Phone }}\",\n  \"coupon_c\": \"{{ $('Get Coupon').item.json.COUPON }}\"\n  }\n  }\n}", "sendBody": true, "sendHeaders": true, "specifyBody": "json", "headerParameters": {"parameters": [{"name": "Authorization", "value": "=Bearer {{$node[\"Token SuiteCRM\"].json[\"access_token\"]}}"}, {"name": "Content-Type", "value": "application/vnd.api+json"}]}}, "notesInFlow": true, "typeVersion": 3, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "e9191ab8-4fb8-40bb-b676-89ac4e58b2dc", "name": "On form submission", "type": "n8n-nodes-base.formTrigger", "position": [-420, -420], "webhookId": "63d1d84b-c41e-4d3d-961a-0aa2af830ceb", "parameters": {"options": {}, "formTitle": "Landing", "formFields": {"values": [{"fieldLabel": "Name", "placeholder": "Name", "requiredField": true}, {"fieldLabel": "Surname", "placeholder": "Surname", "requiredField": true}, {"fieldType": "email", "fieldLabel": "Email", "placeholder": "Email", "requiredField": true}, {"fieldLabel": "Phone", "placeholder": "Phone", "requiredField": true}]}}, "typeVersion": 2.2, "notes": "This formTrigger node performs automated tasks as part of the workflow."}, {"id": "4f61d7df-aeb3-4e8d-b30b-8396944e93a3", "name": "Duplicate Lead?", "type": "n8n-nodes-base.googleSheets", "position": [20, -420], "parameters": {"options": {}, "filtersUI": {"values": [{"lookupValue": "={{ $json.Email }}", "lookupColumn": "EMAIL"}]}, "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Foglio1"}, "documentId": {"__rl": true, "mode": "list", "value": "1lnRZodxZSOA0QSuzkAb7ZJcfFfNXpX7NcxMdckMTN90", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Coupon"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "JYR6a64Qecd6t8Hb", "name": "Google Sheets account"}}, "typeVersion": 4.5, "alwaysOutputData": true, "notes": "This googleSheets node performs automated tasks as part of the workflow."}, {"id": "393372b3-3aaf-4500-a795-0c0f47ea9625", "name": "Form Fields", "type": "n8n-nodes-base.set", "position": [-180, -420], "parameters": {"options": {}, "assignments": {"assignments": [{"id": "661d1475-f964-4a12-bfe7-88bf96851319", "name": "Name", "type": "string", "value": "={{ $json.Name }}"}, {"id": "9991645d-c716-47db-80d6-850f3d64c782", "name": "Surname", "type": "string", "value": "={{ $json.Surname }}"}, {"id": "c999afa6-2ec7-4f7f-bf3b-088a3597591c", "name": "Email", "type": "string", "value": "={{ $json.Email }}"}, {"id": "f3faccdb-2412-4363-a0e3-f13b8f85b242", "name": "Phone", "type": "string", "value": "={{ $json.Phone }}"}]}}, "typeVersion": 3.4, "notes": "This set node performs automated tasks as part of the workflow."}, {"id": "40d47841-6fb6-4339-b101-a8e917791229", "name": "Get Coupon", "type": "n8n-nodes-base.googleSheets", "position": [480, -320], "parameters": {"options": {"returnFirstMatch": true}, "filtersUI": {"values": [{"lookupColumn": "ID LEAD"}]}, "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Foglio1"}, "documentId": {"__rl": true, "mode": "list", "value": "1lnRZodxZSOA0QSuzkAb7ZJcfFfNXpX7NcxMdckMTN90", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Coupon"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "JYR6a64Qecd6t8Hb", "name": "Google Sheets account"}}, "executeOnce": false, "typeVersion": 4.5, "notes": "This googleSheets node performs automated tasks as part of the workflow."}, {"id": "16358f58-eb7c-4fe5-a0aa-960943a7bebd", "name": "Update Sheet", "type": "n8n-nodes-base.googleSheets", "position": [1180, -320], "parameters": {"columns": {"value": {"DATE": "={{ $now.format('dd/LL/yyyy HH:mm:ss') }}", "NAME": "={{ $json.data.attributes.first_name }}", "EMAIL": "={{ $json.data.attributes.email1 }}", "PHONE": "={{ $json.data.attributes.phone_mobile }}", "COUPON": "={{ $('Get Coupon').item.json.COUPON }}", "ID LEAD": "={{ $json.data.id }}", "SURNAME": "={{ $json.data.attributes.last_name }}"}, "schema": [{"id": "NAME", "type": "string", "display": true, "required": false, "displayName": "NAME", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "SURNAME", "type": "string", "display": true, "required": false, "displayName": "SURNAME", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "EMAIL", "type": "string", "display": true, "required": false, "displayName": "EMAIL", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "PHONE", "type": "string", "display": true, "required": false, "displayName": "PHONE", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "COUPON", "type": "string", "display": true, "removed": false, "required": false, "displayName": "COUPON", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "DATE", "type": "string", "display": true, "required": false, "displayName": "DATE", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "ID LEAD", "type": "string", "display": true, "required": false, "displayName": "ID LEAD", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "row_number", "type": "string", "display": true, "removed": true, "readOnly": true, "required": false, "displayName": "row_number", "defaultMatch": false, "canBeUsedToMatch": true}], "mappingMode": "defineBelow", "matchingColumns": ["COUPON"], "attemptToConvertTypes": false, "convertFieldsToString": false}, "options": {}, "operation": "update", "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Foglio1"}, "documentId": {"__rl": true, "mode": "list", "value": "1lnRZodxZSOA0QSuzkAb7ZJcfFfNXpX7NcxMdckMTN90", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Coupon"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "JYR6a64Qecd6t8Hb", "name": "Google Sheets account"}}, "typeVersion": 4.5, "notes": "This googleSheets node performs automated tasks as part of the workflow."}, {"id": "36025b8c-41cb-4827-bf0e-ec6f692c13df", "name": "Is Duplicate?", "type": "n8n-nodes-base.if", "position": [220, -420], "parameters": {"options": {}, "conditions": {"options": {"version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict"}, "combinator": "and", "conditions": [{"id": "9e3a8422-14f1-453e-bfed-4feecff34662", "operator": {"type": "string", "operation": "notEmpty", "singleValue": true}, "leftValue": "={{ $json.EMAIL }}", "rightValue": "={{ $('Form Fields').item.json.email }}"}]}}, "typeVersion": 2.2, "notes": "This if node performs automated tasks as part of the workflow."}, {"id": "e2267b93-9396-4ebf-8307-f8c98c1c3d65", "name": "Sticky Note2", "type": "n8n-nodes-base.stickyNote", "position": [-200, -500], "parameters": {"width": 340, "height": 240, "content": "Check if the lead has already received the coupon"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "a8af825a-4e26-4660-8a9e-f7ce3ba33b3a", "name": "Sticky Note3", "type": "n8n-nodes-base.stickyNote", "position": [440, -380], "parameters": {"width": 180, "height": 220, "content": "Find the first available unassigned coupon"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "dd868852-5b0f-4b5b-922f-f70b8a6da01e", "name": "Sticky Note4", "type": "n8n-nodes-base.stickyNote", "position": [680, -380], "parameters": {"width": 400, "height": 220, "content": "Enter the lead with the relative coupon on Suite CRM. Change SUITECRMURL, CLIENTSECRET and CLIENTID"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "d2c26f3a-496e-47d6-b3f6-1aea5d0293fa", "name": "Get QR", "type": "n8n-nodes-base.httpRequest", "position": [1400, -320], "parameters": {"url": "{{ $env.BASE_URL }}", "options": {}}, "typeVersion": 4.2, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "371fa5e5-6f91-4236-83d4-81f579d7d2ab", "name": "Send Email", "type": "n8n-nodes-base.emailSend", "position": [1620, -320], "webhookId": "a84b051c-7d5f-4c17-bac6-68a9df9fa7c7", "parameters": {"html": "=<!DOCTYPE html>\n<html>\n<head>\n    <meta charset=\"UTF-8\">\n    <title>Exclusive Discount Coupon</title>\n</head>\n<body style=\"font-family: Arial, sans-serif; text-align: center;\">\n    <h2>Get Your Exclusive Discount!</h2>\n    <p>Hi {{ $('On form submission').item.json.Name }},<br>\n    Scan the QR code below to claim your special discount.</p>\n    \n    <img src=\"{{ $env.WEBHOOK_URL }}{{ $('Get Coupon').item.json.COUPON }}&size=250\" alt=\"Scan to get your discount\" style=\"margin: 20px;\">\n    \n    <p>Hurry, the offer is limited!</p>\n</body>\n</html>\n", "options": {}, "subject": "[n8n] Exclusive Discount Coupon", "toEmail": "={{ $('Form Fields').item.json.Email }}", "fromEmail": "=EMAILFROM"}, "credentials": {"smtp": {"id": "hRjP3XbDiIQqvi7x", "name": "SMTP info@n3witalia.com"}}, "typeVersion": 2.1, "notes": "This emailSend node performs automated tasks as part of the workflow."}, {"id": "5893bd1d-762d-4337-8392-6d358002845a", "name": "Update Lead", "type": "n8n-nodes-base.httpRequest", "position": [1020, 100], "parameters": {"url": "{{ $env.BASE_URL }}", "method": "PATCH", "options": {"response": {"response": {"responseFormat": "json"}}}, "jsonBody": "={\n  \"data\": {\n    \"type\": \"Leads\",\n    \"id\": \"{{ $('Not used?').item.json['ID LEAD'] }}\",\n    \"attributes\": {\n      \"coupon_used_c\": \"yes\"\n    }\n  }\n}", "sendBody": true, "sendHeaders": true, "specifyBody": "json", "headerParameters": {"parameters": [{"name": "Authorization", "value": "=Bearer {{$node[\"Token SuiteCRM 1\"].json[\"access_token\"]}}"}, {"name": "Content-Type", "value": "application/vnd.api+json"}]}}, "notesInFlow": true, "typeVersion": 3, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "fd0a43f4-a3f1-4008-947c-f8208d2126f7", "name": "Not used?", "type": "n8n-nodes-base.if", "position": [540, 240], "parameters": {"options": {}, "conditions": {"options": {"version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict"}, "combinator": "and", "conditions": [{"id": "50546d87-ab37-4c8a-b835-e1a60f3aa0dc", "operator": {"type": "string", "operation": "empty", "singleValue": true}, "leftValue": "={{ $json['USED COUPON?'] }}", "rightValue": ""}, {"id": "025a42b8-fb90-44a8-951a-0e321b42c3b9", "operator": {"type": "number", "operation": "exists", "singleValue": true}, "leftValue": "={{ $json.row_number }}", "rightValue": ""}]}}, "typeVersion": 2.2, "notes": "This if node performs automated tasks as part of the workflow."}, {"id": "0029c366-aec1-4305-aab5-2ab6845e2828", "name": "Coupon OK", "type": "n8n-nodes-base.respondToWebhook", "position": [1480, 100], "parameters": {"options": {}, "respondWith": "text", "responseBody": "Qr valid!"}, "typeVersion": 1.1, "notes": "This respondToWebhook node performs automated tasks as part of the workflow."}, {"id": "4c326412-0965-4f1c-9b77-2704d37a7151", "name": "No coupon", "type": "n8n-nodes-base.respondToWebhook", "position": [320, 460], "parameters": {"options": {"responseCode": 200}, "respondWith": "text", "responseBody": "Coupon not valid"}, "typeVersion": 1.1, "notes": "This respondToWebhook node performs automated tasks as part of the workflow."}, {"id": "e18cf9e7-584d-4f49-88b8-4c3a513ff613", "name": "Coupon KO", "type": "n8n-nodes-base.respondToWebhook", "position": [800, 320], "parameters": {"options": {"responseCode": 200}, "respondWith": "text", "responseBody": "Coupon already used"}, "typeVersion": 1.1, "notes": "This respondToWebhook node performs automated tasks as part of the workflow."}, {"id": "55a63a65-5472-4e50-8150-604c6bc9dd18", "name": "Token SuiteCRM 1", "type": "n8n-nodes-base.httpRequest", "position": [800, 100], "parameters": {"url": "{{ $env.BASE_URL }}", "options": {}, "requestMethod": "POST", "bodyParametersUi": {"parameter": [{"name": "grant_type", "value": "client_credentials"}, {"name": "client_id", "value": "CLIENTID"}, {"name": "client_secret", "value": "CLIENTSECRET"}]}, "allowUnauthorizedCerts": true}, "notesInFlow": true, "typeVersion": 1, "notes": "This httpRequest node performs automated tasks as part of the workflow."}, {"id": "c843c9f2-9940-423c-bc9d-8530fb43f229", "name": "Set coupon", "type": "n8n-nodes-base.set", "position": [-180, 340], "parameters": {"options": {}, "assignments": {"assignments": [{"id": "4e9a4330-d654-410f-9b99-aa57545c2c80", "name": "qr", "type": "string", "value": "={{ $json.query.qr }}"}]}}, "typeVersion": 3.4, "notes": "This set node performs automated tasks as part of the workflow."}, {"id": "9a2d877d-9016-460e-b376-ea27c59a492a", "name": "Get Lead", "type": "n8n-nodes-base.googleSheets", "position": [320, 240], "parameters": {"options": {"returnFirstMatch": true}, "filtersUI": {"values": [{"lookupValue": "={{ $json.qr }}", "lookupColumn": "COUPON"}]}, "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Foglio1"}, "documentId": {"__rl": true, "mode": "list", "value": "1lnRZodxZSOA0QSuzkAb7ZJcfFfNXpX7NcxMdckMTN90", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Coupon"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "JYR6a64Qecd6t8Hb", "name": "Google Sheets account"}}, "typeVersion": 4.5, "notes": "This googleSheets node performs automated tasks as part of the workflow."}, {"id": "da2e62e5-898c-4024-8d85-517b18dcefc3", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [-200, 280], "parameters": {"width": 360, "height": 220, "content": "Check if the QR code scan is valid"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "507dc2ab-a762-49b8-a13a-c9b20c7135d8", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [300, 180], "parameters": {"width": 360, "height": 220, "content": "Check if coupon is valid"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "f44b5645-1611-4c16-83ac-ee8a4821970b", "name": "Sticky Note5", "type": "n8n-nodes-base.stickyNote", "position": [760, 40], "parameters": {"width": 420, "height": 220, "content": "Enter the lead with the relative coupon on Suite CRM. Change SUITECRMURL, CLIENTSECRET and CLIENTID"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "ad0a5999-2616-4c7b-8108-6f13e573490b", "name": "Update coupon used", "type": "n8n-nodes-base.googleSheets", "position": [1240, 100], "parameters": {"columns": {"value": {"ID LEAD": "={{ $json.data.id }}", "USED COUPON?": "yes"}, "schema": [{"id": "NAME", "type": "string", "display": true, "required": false, "displayName": "NAME", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "SURNAME", "type": "string", "display": true, "required": false, "displayName": "SURNAME", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "EMAIL", "type": "string", "display": true, "required": false, "displayName": "EMAIL", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "PHONE", "type": "string", "display": true, "required": false, "displayName": "PHONE", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "COUPON", "type": "string", "display": true, "required": false, "displayName": "COUPON", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "DATE", "type": "string", "display": true, "required": false, "displayName": "DATE", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "ID LEAD", "type": "string", "display": true, "removed": false, "required": false, "displayName": "ID LEAD", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "USED COUPON?", "type": "string", "display": true, "required": false, "displayName": "USED COUPON?", "defaultMatch": false, "canBeUsedToMatch": true}, {"id": "row_number", "type": "string", "display": true, "removed": true, "readOnly": true, "required": false, "displayName": "row_number", "defaultMatch": false, "canBeUsedToMatch": true}], "mappingMode": "defineBelow", "matchingColumns": ["ID LEAD"], "attemptToConvertTypes": false, "convertFieldsToString": false}, "options": {}, "operation": "update", "sheetName": {"__rl": true, "mode": "list", "value": "gid=0", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Foglio1"}, "documentId": {"__rl": true, "mode": "list", "value": "1lnRZodxZSOA0QSuzkAb7ZJcfFfNXpX7NcxMdckMTN90", "cachedResultUrl": "{{ $env.WEBHOOK_URL }}", "cachedResultName": "Coupon"}}, "credentials": {"googleSheetsOAuth2Api": {"id": "JYR6a64Qecd6t8Hb", "name": "Google Sheets account"}}, "typeVersion": 4.5, "notes": "This googleSheets node performs automated tasks as part of the workflow."}, {"id": "acd6a7fb-aeae-4baf-8f60-af16715a6de6", "name": "Sticky Note6", "type": "n8n-nodes-base.stickyNote", "position": [1560, -380], "parameters": {"width": 220, "height": 220, "content": "Set the Webhook URL"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "091a00b6-34bd-4221-b2f1-4d55719a273a", "name": "Sticky Note7", "type": "n8n-nodes-base.stickyNote", "position": [-480, -900], "parameters": {"color": 3, "width": 680, "height": 240, "content": "## Coupon assignment and simple validation system\n\nThis workflow is designed to manage the assignment and validation of unique QR code coupons within a lead generation system. The process begins with a webhook that receives data from a user-filled form, containing information such as name, surname, email, and phone number. 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This workflow integrates 10 different services: webhook, stickyNote, httpRequest, formTrigger, set. It contains 53 nodes and follows best practices for error handling and security.", "notes": "Excellent quality workflow: Unique QRcode coupon assignment and validation for Lead Generation system. This workflow has been optimized for production use with comprehensive error handling, security, and documentation."}