The workflow JSON
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{
"name": "[DEV] sms / universal-message-sender",
"description": null,
"active": true,
"nodes": [
{
"id": "webhook-trigger",
"name": "Webhook: Universal Message",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
208,
952
],
"parameters": {
"httpMethod": "POST",
"path": "universal-message-v1",
"responseMode": "responseNode",
"options": {},
"authentication": "headerAuth"
}
},
{
"id": "auth-check",
"name": "Auth: Check Secret",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
432,
952
],
"parameters": {
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "or",
"conditions": [
{
"id": "secret-header",
"leftValue": "={{ $json.headers['x-webhook-secret'] }}",
"rightValue": "wranngle-msg-2026",
"operator": {
"type": "string",
"operation": "equals"
}
},
{
"id": "elevenlabs-origin",
"leftValue": "={{ $json.headers['user-agent'] || '' }}",
"rightValue": "ElevenLabs",
"operator": {
"type": "string",
"operation": "contains"
}
},
{
"id": "localhost-dev",
"leftValue": "={{ $json.headers.host || '' }}",
"rightValue": "localhost",
"operator": {
"type": "string",
"operation": "contains"
}
}
]
},
"options": {}
}
},
{
"id": "respond-unauthorized",
"name": "Error: Unauthorized",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
656,
1024
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'UNAUTHORIZED', message: 'Invalid or missing authentication' } }}",
"options": {
"responseCode": 401
}
}
},
{
"id": "extract-params",
"name": "Extract & Normalize Parameters",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
656,
832
],
"parameters": {
"assignments": {
"assignments": [
{
"id": "request_id",
"name": "request_id",
"value": "={{ $now.toMillis() + '-' + Math.random().toString(36).substring(7) }}",
"type": "string"
},
{
"id": "phone_raw",
"name": "phone_raw",
"value": "={{ ($json.body?.phone_number || $json.phone_number || '').toString() }}",
"type": "string"
},
{
"id": "phone_clean",
"name": "phone_number",
"value": "={{ ($json.body?.phone_number || $json.phone_number || '').toString().replace(/[^0-9+]/g, '') }}",
"type": "string"
},
{
"id": "channel",
"name": "channel",
"value": "={{ $json.body?.channel || $json.channel || 'auto' }}",
"type": "string"
},
{
"id": "template",
"name": "template",
"value": "={{ $json.body?.template || $json.template || 'welcome' }}",
"type": "string"
},
{
"id": "variables",
"name": "variables",
"value": "={{ $json.body?.variables || $json.variables || {} }}",
"type": "object"
},
{
"id": "timestamp",
"name": "timestamp",
"value": "={{ $now.toISO() }}",
"type": "string"
}
]
},
"options": {}
}
},
{
"id": "validate-phone",
"name": "Validate Phone Format",
"type": "n8n-nodes-base.switch",
"typeVersion": 3.2,
"position": [
880,
800
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "us-ca-format",
"leftValue": "={{ $json.phone_number }}",
"rightValue": "^\\+1[2-9][0-9]{9}$",
"operator": {
"type": "string",
"operation": "regex"
}
}
]
}
},
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "intl-format",
"leftValue": "={{ $json.phone_number }}",
"rightValue": "^\\+[1-9][0-9]{6,14}$",
"operator": {
"type": "string",
"operation": "regex"
}
}
]
}
},
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "empty-phone",
"leftValue": "={{ $json.phone_number }}",
"rightValue": "",
"operator": {
"type": "string",
"operation": "equals"
}
}
]
}
}
]
},
"options": {
"fallbackOutput": "extra"
}
}
},
{
"id": "respond-missing-phone",
"name": "Error: Missing Phone",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1104,
736
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'MISSING_PHONE_NUMBER', message: 'No phone number provided', request_id: $json.request_id } }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "respond-invalid-phone",
"name": "Error: Invalid Phone",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1104,
928
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'INVALID_PHONE_FORMAT', message: 'Phone number format invalid', provided: $json.phone_raw, cleaned: $json.phone_number, request_id: $json.request_id } }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "merge-valid-phones",
"name": "Merge Valid Paths",
"type": "n8n-nodes-base.merge",
"typeVersion": 3,
"position": [
1104,
544
],
"parameters": {}
},
{
"id": "send-via-twilio",
"name": "Send via Twilio Messaging Service",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
1552,
544
],
"parameters": {
"method": "POST",
"url": "https://api.twilio.com/2010-04-01/Accounts/<REDACTED:twilio-account-sid>/Messages.json",
"authentication": "genericCredentialType",
"genericAuthType": "httpBasicAuth",
"sendBody": true,
"contentType": "form-urlencoded",
"bodyParameters": {
"parameters": [
{
"name": "To",
"value": "={{ $json.phone_number }}"
},
{
"name": "MessagingServiceSid",
"value": "MG18bfef5a022578102a9165c1c9a514db"
},
{
"name": "ContentSid",
"value": "={{ $json.content_sid }}"
},
{
"name": "ContentVariables",
"value": "={{ $json.content_variables }}"
}
]
},
"options": {}
},
"onError": "continueErrorOutput"
},
{
"id": "check-send-result",
"name": "Check Send Result",
"type": "n8n-nodes-base.switch",
"typeVersion": 3.2,
"position": [
1776,
280
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "has-sid",
"leftValue": "={{ $json.sid }}",
"rightValue": "",
"operator": {
"type": "string",
"operation": "notEmpty"
}
}
]
}
},
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "is-retryable",
"leftValue": "={{ [30003, 30005, 30008, 30009, 30010].includes($json.code || $json.error_code) || ($json.message || '').toLowerCase().includes('temporarily') }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "equals"
}
}
]
}
}
]
},
"options": {
"fallbackOutput": "extra"
}
}
},
{
"id": "verify-delivery",
"name": "Verify: Fetch Status",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
2000,
-32
],
"parameters": {
"url": "=https://api.twilio.com/2010-04-01/Accounts/<REDACTED:twilio-account-sid>/Messages/{{ $json.sid }}.json",
"authentication": "genericCredentialType",
"genericAuthType": "httpBasicAuth",
"options": {
"timeout": 10000
}
},
"onError": "continueRegularOutput"
},
{
"id": "route-by-delivery",
"name": "Route: Delivery Status",
"type": "n8n-nodes-base.switch",
"typeVersion": 3.2,
"position": [
2224,
-48
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "or",
"conditions": [
{
"id": "is-delivered",
"leftValue": "={{ $json.status }}",
"rightValue": "delivered",
"operator": {
"type": "string",
"operation": "equals"
}
},
{
"id": "is-sent",
"leftValue": "={{ $json.status }}",
"rightValue": "sent",
"operator": {
"type": "string",
"operation": "equals"
}
}
]
}
},
{
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "or",
"conditions": [
{
"id": "is-failed",
"leftValue": "={{ $json.status }}",
"rightValue": "failed",
"operator": {
"type": "string",
"operation": "equals"
}
},
{
"id": "is-undelivered",
"leftValue": "={{ $json.status }}",
"rightValue": "undelivered",
"operator": {
"type": "string",
"operation": "equals"
}
}
]
}
}
]
},
"options": {
"fallbackOutput": "extra"
}
}
},
{
"id": "respond-success",
"name": "Success: Delivered",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
2448,
-128
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: true, status: 'delivered', channel: $('Compose Message').first().json.channel, message_sid: $('Send via Twilio Messaging Service').first().json.sid, recipient: $('Compose Message').first().json.phone_number, template: $('Compose Message').first().json.template, request_id: $('Compose Message').first().json.request_id } }}",
"options": {
"responseCode": 200
}
}
},
{
"id": "respond-pending",
"name": "Warning: Pending",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
2448,
256
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: true, status: 'pending', note: 'Message accepted, delivery not yet confirmed', message_sid: $('Send via Twilio Messaging Service').first().json.sid, recipient: $('Compose Message').first().json.phone_number, request_id: $('Compose Message').first().json.request_id } }}",
"options": {
"responseCode": 202
}
}
},
{
"id": "build-error-response",
"name": "Build: Error Details",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
2448,
64
],
"parameters": {
"assignments": {
"assignments": [
{
"id": "troubleshoot",
"name": "troubleshooting",
"value": "={{ (() => { const code = $json.error_code; const map = { 30032: 'Toll-free not A2P verified', 21211: 'Invalid phone format', 21614: 'Not SMS-capable', 30003: 'Carrier unreachable' }; return map[code] || 'Check Twilio docs'; })() }}",
"type": "string"
}
]
},
"options": {}
}
},
{
"id": "respond-delivery-failed",
"name": "Error: Delivery Failed",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
2672,
64
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'DELIVERY_FAILED', message_sid: $('Send via Twilio Messaging Service').first().json.sid, recipient: $('Compose Message').first().json.phone_number, error_code: $json.error_code, request_id: $('Compose Message').first().json.request_id } }}",
"options": {
"responseCode": 500
}
}
},
{
"id": "retry-logic",
"name": "Retry: Check Attempts",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
2000,
496
],
"parameters": {
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "under-max",
"leftValue": "={{ $('Compose Message').first().json.attempt_number || 1 }}",
"rightValue": 3,
"operator": {
"type": "number",
"operation": "lt"
}
}
]
},
"options": {}
}
},
{
"id": "wait-before-retry",
"name": "Wait Before Retry",
"type": "n8n-nodes-base.wait",
"typeVersion": 1.1,
"position": [
2224,
400
],
"parameters": {
"amount": "={{ Math.pow(2, $('Compose Message').first().json.attempt_number || 1) }}"
}
},
{
"id": "increment-attempt",
"name": "Increment Attempt Counter",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
2448,
664
],
"parameters": {
"assignments": {
"assignments": [
{
"id": "attempt",
"name": "attempt_number",
"value": "={{ ($('Compose Message').first().json.attempt_number || 1) + 1 }}",
"type": "number"
}
]
},
"options": {}
}
},
{
"id": "respond-max-retries",
"name": "Error: Max Retries",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
2224,
592
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'MAX_RETRIES_EXCEEDED', message: 'Failed after 3 attempts', recipient: $('Compose Message').first().json.phone_number, request_id: $('Compose Message').first().json.request_id } }}",
"options": {
"responseCode": 500
}
}
},
{
"id": "respond-permanent-error",
"name": "Error: Permanent Failure",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
2000,
688
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: 'TWILIO_PERMANENT_ERROR', error_code: $json.code || $json.error_code, recipient: $('Compose Message').first().json.phone_number, request_id: $('Compose Message').first().json.request_id } }}",
"options": {
"responseCode": 400
}
}
},
{
"id": "compose-message",
"name": "Compose Message",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1328,
544
],
"parameters": {
"jsCode": "const item = $input.first().json;\nconst v = item.variables || {};\nconst t = item.template || 'welcome';\n\n// --- Template registry ---\nconst VALID_TEMPLATES = [\n 'welcome', 'invoice-receipt', 'notification', 'password-reset',\n 'lead-intake', 'sales-cold-outreach', 'sales-demo-followup',\n 'sales-proposal-sent', 'sales-quote-followup', 'sales-winback'\n];\n\nconst errors = [];\n\nif (!VALID_TEMPLATES.includes(t)) {\n errors.push(`INVALID_TEMPLATE: \"${t}\" is not valid. Valid: ${VALID_TEMPLATES.join(', ')}`);\n}\n\n// --- Required variables per template ---\nconst REQUIRED = {\n 'welcome': ['FIRST_NAME', 'PACKAGE'],\n 'invoice-receipt': ['AMOUNT', 'INVOICE_ID'],\n 'notification': ['EVENT_TYPE', 'EVENT_DATA'],\n 'password-reset': ['RESET_URL', 'EXPIRY_TIME'],\n 'lead-intake': ['BUSINESS_NAME', 'INDUSTRY', 'OWNER_NAME', 'PHONE'],\n 'sales-cold-outreach': ['FIRST_NAME', 'COMPANY', 'REP_NAME'],\n 'sales-demo-followup': ['FIRST_NAME', 'REP_EMAIL'],\n 'sales-proposal-sent': ['FIRST_NAME', 'PACKAGE', 'PRICE'],\n 'sales-quote-followup': ['FIRST_NAME', 'QUOTE_ID', 'REP_NAME'],\n 'sales-winback': ['FIRST_NAME', 'NEW_FEATURE_1', 'NEW_FEATURE_2']\n};\n\nif (REQUIRED[t]) {\n const missing = REQUIRED[t].filter(k => !v[k] && v[k] !== 0);\n if (missing.length > 0) {\n errors.push(`MISSING_VARIABLES: Template \"${t}\" requires: ${missing.join(', ')}`);\n }\n}\n\n// --- Format validation (only if no missing var errors) ---\nif (errors.length === 0) {\n if (t === 'password-reset' && !/^https?:\\/\\/.+/.test(v.RESET_URL)) {\n errors.push('INVALID_RESET_URL: Must be a full URL starting with https://');\n }\n if (t === 'invoice-receipt') {\n const amt = String(v.AMOUNT).replace(/[$,]/g, '');\n if (isNaN(Number(amt)) || Number(amt) <= 0) {\n errors.push(`INVALID_AMOUNT: \"${v.AMOUNT}\" is not a valid positive number`);\n } else {\n v.AMOUNT = amt;\n }\n }\n if (t === 'sales-proposal-sent') {\n const price = String(v.PRICE).replace(/[$,]/g, '');\n if (isNaN(Number(price)) || Number(price) <= 0) {\n errors.push(`INVALID_PRICE: \"${v.PRICE}\" is not a valid positive number`);\n } else {\n v.PRICE = price;\n }\n }\n if (t === 'sales-demo-followup' && !/^[^@]+@[^@]+\\.[^@]+$/.test(v.REP_EMAIL)) {\n errors.push(`INVALID_REP_EMAIL: \"${v.REP_EMAIL}\" is not a valid email`);\n }\n}\n\n// --- If validation failed, return error payload ---\nif (errors.length > 0) {\n return [{\n json: {\n validation_error: true,\n error: errors[0],\n all_errors: errors,\n phone_number: item.phone_number,\n template: t,\n request_id: item.request_id\n }\n }];\n}\n\n// --- Sanitize: trim all string values, cap at 500 chars ---\nfor (const key of Object.keys(v)) {\n if (typeof v[key] === 'string') {\n v[key] = v[key].trim().substring(0, 500);\n }\n}\n\n// --- Content SID mapping ---\nconst SIDS = {\n 'welcome': '<REDACTED:twilio-content-sid>',\n 'invoice-receipt': '<REDACTED:twilio-content-sid>',\n 'notification': '<REDACTED:twilio-content-sid>',\n 'password-reset': '<REDACTED:twilio-content-sid>',\n 'lead-intake': '<REDACTED:twilio-content-sid>',\n 'sales-cold-outreach': '<REDACTED:twilio-content-sid>',\n 'sales-demo-followup': '<REDACTED:twilio-content-sid>',\n 'sales-proposal-sent': '<REDACTED:twilio-content-sid>',\n 'sales-quote-followup': '<REDACTED:twilio-content-sid>',\n 'sales-winback': '<REDACTED:twilio-content-sid>'\n};\n\nconst VAR_MAPS = {\n 'welcome': {'1': v.FIRST_NAME, '2': v.PACKAGE},\n 'invoice-receipt': {'1': v.AMOUNT, '2': v.INVOICE_ID},\n 'notification': {'1': v.EVENT_TYPE, '2': v.EVENT_DATA},\n 'password-reset': {'1': v.RESET_URL, '2': v.EXPIRY_TIME},\n 'lead-intake': {'1': v.BUSINESS_NAME, '2': v.INDUSTRY, '3': v.OWNER_NAME, '4': v.PHONE},\n 'sales-cold-outreach': {'1': v.FIRST_NAME, '2': v.COMPANY, '3': v.REP_NAME},\n 'sales-demo-followup': {'1': v.FIRST_NAME, '2': v.REP_EMAIL},\n 'sales-proposal-sent': {'1': v.FIRST_NAME, '2': v.PACKAGE, '3': v.PRICE},\n 'sales-quote-followup': {'1': v.FIRST_NAME, '2': v.QUOTE_ID, '3': v.REP_NAME},\n 'sales-winback': {'1': v.FIRST_NAME, '2': v.NEW_FEATURE_1, '3': v.NEW_FEATURE_2}\n};\n\nreturn [{\n json: {\n validation_error: false,\n phone_number: item.phone_number,\n channel: item.channel,\n template: t,\n variables: v,\n request_id: item.request_id,\n content_sid: SIDS[t],\n content_variables: JSON.stringify(VAR_MAPS[t]),\n attempt_number: 1\n }\n}];"
}
},
{
"id": "validation-gate",
"name": "Validation Gate",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
1440,
544
],
"parameters": {
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "is-valid",
"leftValue": "={{ $json.validation_error }}",
"rightValue": false,
"operator": {
"type": "boolean",
"operation": "equals"
}
}
]
},
"options": {}
}
},
{
"id": "respond-validation-error",
"name": "Error: Validation Failed",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
1660,
700
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ { success: false, error: $json.error, all_errors: $json.all_errors, template: $json.template, request_id: $json.request_id } }}",
"options": {
"responseCode": 400
}
}
}
],
"connections": {
"Webhook: Universal Message": {
"main": [
[
{
"node": "Auth: Check Secret",
"type": "main",
"index": 0
}
]
]
},
"Auth: Check Secret": {
"main": [
[
{
"node": "Extract & Normalize Parameters",
"type": "main",
"index": 0
}
],
[
{
"node": "Error: Unauthorized",
"type": "main",
"index": 0
}
]
]
},
"Extract & Normalize Parameters": {
"main": [
[
{
"node": "Validate Phone Format",
"type": "main",
"index": 0
}
]
]
},
"Validate Phone Format": {
"main": [
[
{
"node": "Merge Valid Paths",
"type": "main",
"index": 0
}
],
[
{
"node": "Merge Valid Paths",
"type": "main",
"index": 1
}
],
[
{
"node": "Error: Missing Phone",
"type": "main",
"index": 0
}
],
[
{
"node": "Error: Invalid Phone",
"type": "main",
"index": 0
}
]
]
},
"Send via Twilio Messaging Service": {
"main": [
[
{
"node": "Check Send Result",
"type": "main",
"index": 0
}
],
[
{
"node": "Check Send Result",
"type": "main",
"index": 0
}
]
]
},
"Check Send Result": {
"main": [
[
{
"node": "Verify: Fetch Status",
"type": "main",
"index": 0
}
],
[
{
"node": "Retry: Check Attempts",
"type": "main",
"index": 0
}
],
[
{
"node": "Error: Permanent Failure",
"type": "main",
"index": 0
}
]
]
},
"Retry: Check Attempts": {
"main": [
[
{
"node": "Wait Before Retry",
"type": "main",
"index": 0
}
],
[
{
"node": "Error: Max Retries",
"type": "main",
"index": 0
}
]
]
},
"Wait Before Retry": {
"main": [
[
{
"node": "Increment Attempt Counter",
"type": "main",
"index": 0
}
]
]
},
"Increment Attempt Counter": {
"main": [
[
{
"node": "Send via Twilio Messaging Service",
"type": "main",
"index": 0
}
]
]
},
"Verify: Fetch Status": {
"main": [
[
{
"node": "Route: Delivery Status",
"type": "main",
"index": 0
}
]
]
},
"Route: Delivery Status": {
"main": [
[
{
"node": "Success: Delivered",
"type": "main",
"index": 0
}
],
[
{
"node": "Build: Error Details",
"type": "main",
"index": 0
}
],
[
{
"node": "Warning: Pending",
"type": "main",
"index": 0
}
]
]
},
"Build: Error Details": {
"main": [
[
{
"node": "Error: Delivery Failed",
"type": "main",
"index": 0
}
]
]
},
"Merge Valid Paths": {
"main": [
[
{
"node": "Compose Message",
"type": "main",
"index": 0
}
]
]
},
"Compose Message": {
"main": [
[
{
"node": "Validation Gate",
"type": "main",
"index": 0
}
]
]
},
"Validation Gate": {
"main": [
[
{
"node": "Send via Twilio Messaging Service",
"type": "main",
"index": 0
}
],
[
{
"node": "Error: Validation Failed",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1",
"saveDataErrorExecution": "all",
"saveDataSuccessExecution": "all",
"saveManualExecutions": true,
"callerPolicy": "workflowsFromSameOwner",
"availableInMCP": false
},
"tags": []
}
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About this workflow
[DEV] sms / universal-message-sender. Uses httpRequest. Webhook trigger; 24 nodes.
Source: https://github.com/wranngle/n8n_showcase/blob/main/workflows/sms/universal-message-sender.json — original creator credit. Request a take-down →
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