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Authentica email verification with BillionVerify
Authentica is a developer tool for identity and authentication workflows. Pairing it with BillionVerify adds an email-quality layer to your authentication pipeline, ensuring that the addresses users register with are real, reachable, and free from disposable or fraudulent patterns.
Why verify before the send
Authentication systems that skip email validation become targets for fake account creation using throwaway addresses. BillionVerify gives Authentica-powered apps a lightweight but effective filter, blocking invalid and disposable addresses before they enter your identity store and cause downstream problems.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Authentica sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key. Adapted from this n8n template
verify-emails-in-authentica.json
{
"name": "Register users and authenticate with magic links using Google Sheets + BillionVerify",
"nodes": [
{
"id": "dcaa8a9d-abdd-41a8-a359-868318d7f661",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
160,
608
],
"parameters": {
"color": 7,
"width": 1904,
"height": 384,
"content": "## 1. Login\nValidate username and password against Google Sheets, then reuse or issue a new token and redirect to the auth endpoint."
},
"typeVersion": 1
},
{
"id": "44324518-59de-4068-b49d-da5b9cabcf66",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
160,
224
],
"parameters": {
"color": 7,
"width": 1232,
"height": 288,
"content": "## 0. Register\nCollect an email address via form, generate credentials and a one-time token, save the user to Google Sheets, and send an onboarding email with the login link."
},
"typeVersion": 1
},
{
"id": "2472b7c4-cd6e-4194-8d12-59c4249ea7f3",
"name": "Append or update row in sheet",
"type": "n8n-nodes-base.googleSheets",
"position": [
688,
320
],
"parameters": {
"columns": {
"value": {
"role": "Property Manager",
"token": "YOUR_CREDENTIAL_HERE",
"password": "YOUR_CREDENTIAL_HERE",
"username": "={{ $json.email }}"
},
"schema": [
{
"id": "username",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "username",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "role",
"type": "string",
"display": true,
"required": false,
"displayName": "role",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "password",
"type": "string",
"display": true,
"required": false,
"displayName": "password",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "token",
"type": "string",
"display": true,
"required": false,
"displayName": "token",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"username"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
},
"options": {},
"operation": "appendOrUpdate",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7
},
{
"id": "d7f38863-74ee-4bb9-bb4d-2fd445594eea",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
160,
1072
],
"parameters": {
"color": 7,
"width": 1696,
"height": 400,
"content": "## 2. Auth\nValidate the one-time token via Google Sheets, generate a session id (sid), set an HttpOnly cookie, clear the token, and redirect to the profile page."
},
"typeVersion": 1
},
{
"id": "891d65a6-0b6c-474d-b029-d4702c8e4174",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
160,
1552
],
"parameters": {
"color": 7,
"width": 1424,
"height": 416,
"content": "## 3. Profile\nRead the sid cookie, look up the active session in Google Sheets, and render a profile page — or redirect to login if the session is invalid."
},
"typeVersion": 1
},
{
"id": "fee598fe-64d8-469e-be7d-745bd2be40e4",
"name": "Prepare sid",
"type": "n8n-nodes-base.code",
"position": [
1248,
1088
],
"parameters": {
"jsCode": "function makeSid(len = 48) {\n const alphabet = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_\";\n let out = \"\";\n // Mix time + random to reduce collisions\n let seed = Date.now().toString(36) + \"-\" + Math.random().toString(36).slice(2);\n\n out += seed.replace(/[^a-z0-9-]/gi, \"\").slice(0, 12);\n\n while (out.length < len) {\n out += alphabet[Math.floor(Math.random() * alphabet.length)];\n }\n return out.slice(0, len);\n}\n\nconst sid = makeSid(64);\n\nreturn { json: { sid } };\n"
},
"typeVersion": 2
},
{
"id": "f8747e29-893d-4e5d-916c-bb56975eb881",
"name": "Generate token",
"type": "n8n-nodes-base.code",
"position": [
1328,
816
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "function makeToken(len = 32) {\n let out = '';\n while (out.length < len) {\n out += Math.random().toString(36).slice(2); // Strip the leading \"0.\"\n }\n return out.slice(0, len);\n}\nconst token = makeToken()\nreturn {token};"
},
"typeVersion": 2
},
{
"id": "fd48786d-6e97-4361-bce0-40dc80596ba2",
"name": "If has token in DB",
"type": "n8n-nodes-base.if",
"position": [
976,
640
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "df0d0deb-4db8-4ef7-9bd0-c79ab6fb4f35",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $('Check username/password').item.json.token }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "43b3e0a0-c749-4b08-8cc1-0e84fe357bed",
"name": "If has token",
"type": "n8n-nodes-base.if",
"position": [
464,
1200
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "51cff10a-dac2-4480-a177-3b6166e4fbdf",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $('Auth').item.json.query.token }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "18b1b20d-06cb-44c5-b295-2966ff15c84f",
"name": "Search by token",
"type": "n8n-nodes-base.googleSheets",
"position": [
736,
1184
],
"parameters": {
"options": {},
"filtersUI": {
"values": [
{
"lookupValue": "={{ $('Auth').item.json.query.token || '' }}",
"lookupColumn": "token"
}
]
},
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7,
"alwaysOutputData": true
},
{
"id": "dc27c8ff-75d6-4448-afb2-512d21cb08bf",
"name": "On form register",
"type": "n8n-nodes-base.formTrigger",
"position": [
224,
320
],
"webhookId": "eff757ba-8869-4106-b386-8c3b21baa912",
"parameters": {
"options": {
"path": "register"
},
"formTitle": "Register with your email",
"formFields": {
"values": [
{
"fieldLabel": "Email",
"requiredField": true
}
]
},
"formDescription": "Password will be sent to your email"
},
"typeVersion": 2.2
},
{
"id": "135c6108-45ec-45e6-b1e2-317e40a9004f",
"name": "Create password and token",
"type": "n8n-nodes-base.code",
"position": [
448,
320
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "function generatePassword(length = 12) {\n const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';\n let out = '';\n for (let i = 0; i < length; i++) {\n const idx = Math.floor(Math.random() * chars.length);\n out += chars[idx];\n }\n return out;\n}\nfunction makeToken(len = 32) {\n let out = '';\n while (out.length < len) {\n out += Math.random().toString(36).slice(2); // Strip the leading \"0.\"\n }\n return out.slice(0, len);\n}\nconst email = $json.Email\nconst password = generatePassword()\nconst token = makeToken()\nreturn {email, password, token};"
},
"typeVersion": 2
},
{
"id": "fec2646b-dd15-4e8c-ad07-9fa7de065c9a",
"name": "Send username/password",
"type": "n8n-nodes-base.gmail",
"position": [
928,
320
],
"webhookId": "f66d080e-d94a-4244-99aa-fc2ebcbbece3",
"parameters": {
"sendTo": "={{ $('Create password and token').item.json.email }}",
"message": "=Link to login: https://YOUR_DOMAIN/webhook/auth?token={{ $('Create password and token').item.json.token }}\n<br/>\nUsername: {{ $('Create password and token').item.json.email }}\n<br/>\nPassword: {{ $('Create password and token').item.json.password }}",
"options": {},
"subject": "=Your login credentials"
},
"typeVersion": 2.1
},
{
"id": "f3241140-939d-4871-8bf3-25dc9c69b653",
"name": "Notice register success",
"type": "n8n-nodes-base.form",
"position": [
1184,
320
],
"webhookId": "9a192624-7617-44d3-a3c2-80e2c1839422",
"parameters": {
"options": {},
"operation": "completion",
"completionTitle": "Registration successful",
"completionMessage": "=<p><strong>✅ Please check email {{ $('Create password and token').item.json.email }} to get your login credentials</strong></p>\n<p>\n After that, you can login here:<br>\n <a href=\"https://YOUR_DOMAIN/form/login\" target=\"_blank\" rel=\"noopener noreferrer\">\n https://YOUR_DOMAIN/form/login\n </a>\n</p>"
},
"typeVersion": 1
},
{
"id": "3da0b92c-edad-43e2-bcf1-e7bca316d7e9",
"name": "On form login",
"type": "n8n-nodes-base.formTrigger",
"position": [
224,
736
],
"webhookId": "f738ecda-fe2c-4892-8fd6-382ec06f45fd",
"parameters": {
"options": {
"path": "login"
},
"formTitle": "Login",
"formFields": {
"values": [
{
"fieldLabel": "username",
"requiredField": true
},
{
"fieldType": "password",
"fieldLabel": "password",
"requiredField": true
}
]
}
},
"typeVersion": 2.2
},
{
"id": "caceffd3-862e-4ffc-817e-ed1300546caa",
"name": "Check username/password",
"type": "n8n-nodes-base.googleSheets",
"position": [
480,
736
],
"parameters": {
"options": {},
"filtersUI": {
"values": [
{
"lookupValue": "={{ $json.username }}",
"lookupColumn": "username"
},
{
"lookupValue": "={{ $json.password }}",
"lookupColumn": "password"
}
]
},
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7,
"alwaysOutputData": true
},
{
"id": "91c227fd-ecbb-4d9f-a608-4606453a0e93",
"name": "If login success",
"type": "n8n-nodes-base.if",
"position": [
720,
736
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "455881ad-941f-4257-9427-1e48e7bc2974",
"operator": {
"type": "object",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "cedd4efe-c0e3-447b-a368-f4da51b0e004",
"name": "Redirect to login form",
"type": "n8n-nodes-base.form",
"position": [
992,
816
],
"webhookId": "9a192624-7617-44d3-a3c2-80e2c1839422",
"parameters": {
"options": {},
"operation": "completion",
"redirectUrl": "=https://YOUR_DOMAIN/form/login",
"respondWith": "redirect"
},
"typeVersion": 1
},
{
"id": "6c2905c0-67d1-4c29-8ee5-3676d6ab1255",
"name": "Redirect to auth url",
"type": "n8n-nodes-base.form",
"position": [
1312,
624
],
"webhookId": "9a192624-7617-44d3-a3c2-80e2c1839422",
"parameters": {
"options": {},
"operation": "completion",
"redirectUrl": "=https://YOUR_DOMAIN/webhook/auth?token={{ $json.token }}",
"respondWith": "redirect"
},
"typeVersion": 1
},
{
"id": "52426a88-2b8f-4839-b608-8c28e8cef5b1",
"name": "Add token to DB",
"type": "n8n-nodes-base.googleSheets",
"position": [
1568,
816
],
"parameters": {
"columns": {
"value": {
"token": "YOUR_CREDENTIAL_HERE",
"username": "={{ $('Check username/password').item.json.username }}"
},
"schema": [
{
"id": "username",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "username",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "role",
"type": "string",
"display": true,
"removed": true,
"required": false,
"displayName": "role",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "password",
"type": "string",
"display": true,
"removed": true,
"required": false,
"displayName": "password",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "token",
"type": "string",
"display": true,
"required": false,
"displayName": "token",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"username"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
},
"options": {},
"operation": "appendOrUpdate",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7
},
{
"id": "1a3c065f-b882-4088-9c34-5ebbb4fb787a",
"name": "Redirect to auth with new token",
"type": "n8n-nodes-base.form",
"position": [
1840,
816
],
"webhookId": "9a192624-7617-44d3-a3c2-80e2c1839422",
"parameters": {
"options": {},
"operation": "completion",
"redirectUrl": "=https://YOUR_DOMAIN/webhook/auth?token={{ $('Generate token').item.json.token }}",
"respondWith": "redirect"
},
"typeVersion": 1
},
{
"id": "b4e2aebf-3f52-4234-ae86-f7c29f2a226d",
"name": "Auth",
"type": "n8n-nodes-base.webhook",
"position": [
208,
1200
],
"webhookId": "6f7a23ce-b823-4dcb-af08-c7e91114292b",
"parameters": {
"path": "auth",
"options": {},
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "340dcc3d-797c-44ca-a5ab-830687fbfffa",
"name": "Invalid token",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
736,
1344
],
"parameters": {
"options": {},
"respondWith": "text",
"responseBody": "Invalid token"
},
"typeVersion": 1.4
},
{
"id": "6119d68b-76d0-40ce-8ac1-df2253ca1a81",
"name": "If token valid",
"type": "n8n-nodes-base.if",
"position": [
976,
1184
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "a29fd91f-24e3-4302-9735-25419166511b",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json.username }}",
"rightValue": ""
}
]
}
},
"executeOnce": true,
"typeVersion": 2.2
},
{
"id": "d3588bf0-be76-4e85-9ac4-ce11de129b25",
"name": "Redirect to login form1",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1248,
1280
],
"parameters": {
"options": {},
"redirectURL": "={{ 'https://' + $('Auth').item.json.headers.host }}/form/login",
"respondWith": "redirect"
},
"typeVersion": 1.4
},
{
"id": "4d02d506-b001-45b8-afab-32ac76d29896",
"name": "Update sid",
"type": "n8n-nodes-base.googleSheets",
"position": [
1600,
1088
],
"parameters": {
"columns": {
"value": {
"sid": "={{ $json.sid }}",
"token": "",
"username": "={{ $('Search by token').item.json.username }}"
},
"schema": [
{
"id": "username",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "username",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "role",
"type": "string",
"display": true,
"removed": true,
"required": false,
"displayName": "role",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "password",
"type": "string",
"display": true,
"removed": true,
"required": false,
"displayName": "password",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "token",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "token",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "sid",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "sid",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "row_number",
"type": "number",
"display": true,
"removed": true,
"readOnly": true,
"required": false,
"displayName": "row_number",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [
"username"
],
"attemptToConvertTypes": false,
"convertFieldsToString": false
},
"options": {},
"operation": "update",
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7
},
{
"id": "0960c383-12b3-4176-8501-3b85d9453256",
"name": "Redirect to profile and set cookies",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1600,
1280
],
"parameters": {
"options": {
"responseCode": 302,
"responseHeaders": {
"entries": [
{
"name": "Set-Cookie",
"value": "=sid={{$json.sid}}; Path=/; HttpOnly; Secure; SameSite=Lax; Max-Age=604800"
},
{
"name": "Location",
"value": "/webhook/profile"
}
]
}
},
"respondWith": "text",
"responseBody": "={{ $json.sid }}"
},
"typeVersion": 1.4
},
{
"id": "ed4908f3-50f0-4150-adbc-ca5b706a94e3",
"name": "Profile",
"type": "n8n-nodes-base.webhook",
"position": [
224,
1712
],
"webhookId": "6f7a23ce-b823-4dcb-af08-c7e91114292b",
"parameters": {
"path": "profile",
"options": {},
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "2d514f17-01f8-4410-a759-50289488502f",
"name": "Check sid cookies header",
"type": "n8n-nodes-base.code",
"position": [
448,
1712
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "function getCookie(headers, name) {\n const raw = (headers.cookie || headers.Cookie || \"\");\n if (!raw) return null;\n\n const parts = raw.split(\";\").map(s => s.trim());\n for (const p of parts) {\n const eq = p.indexOf(\"=\");\n if (eq === -1) continue;\n const k = p.slice(0, eq).trim();\n const v = p.slice(eq + 1).trim();\n if (k === name) return decodeURIComponent(v);\n }\n return null;\n}\n\nconst headers = $json.headers || {};\nconst sid = getCookie(headers, \"sid\");\n\nreturn {\n json: {\n sid,\n hasCookieHeader: !!(headers.cookie || headers.Cookie),\n }\n};\n"
},
"typeVersion": 2
},
{
"id": "9d062264-f2c0-4659-b68f-714b03389ac4",
"name": "Search sid",
"type": "n8n-nodes-base.googleSheets",
"position": [
672,
1712
],
"parameters": {
"options": {},
"filtersUI": {
"values": [
{
"lookupValue": "={{ $json.sid || '' }}",
"lookupColumn": "sid"
}
]
},
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Sheet2"
},
"documentId": {
"__rl": true,
"mode": "url",
"value": "https://docs.google.com/spreadsheets/d/YOUR_SPREADSHEET_ID"
}
},
"typeVersion": 4.7,
"alwaysOutputData": true
},
{
"id": "d7dd2d42-a6bf-4adb-9571-1736cdb11703",
"name": "If has data with sid",
"type": "n8n-nodes-base.if",
"position": [
880,
1712
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "a29fd91f-24e3-4302-9735-25419166511b",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json.username }}",
"rightValue": ""
}
]
}
},
"executeOnce": true,
"typeVersion": 2.2
},
{
"id": "89d72c2d-0f9a-4e63-a1e0-7245cdafad39",
"name": "Redirect to login",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1168,
1808
],
"parameters": {
"options": {},
"redirectURL": "={{ 'https://' + $('Profile').item.json.headers.host }}/form/login",
"respondWith": "redirect"
},
"typeVersion": 1.4
},
{
"id": "e13952a5-dc41-4429-a0ba-bb918e18e41f",
"name": "Prepare html",
"type": "n8n-nodes-base.code",
"position": [
1168,
1568
],
"parameters": {
"jsCode": "const html = `Hello ${$input.first().json.username}`;\n\nreturn { json: { html } };\n"
},
"typeVersion": 2
},
{
"id": "bbb5e14a-e5f1-4eff-acb0-e02203922a70",
"name": "Show profile page",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1392,
1568
],
"parameters": {
"options": {},
"respondWith": "text",
"responseBody": "={{ $json.html }}"
},
"typeVersion": 1.4
},
{
"id": "9496073d-aaa6-4d65-a2d5-a4ee7cd3c85c",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-896,
576
],
"parameters": {
"width": 880,
"height": 720,
"content": "## Overview\nThis workflow provides a lightweight authentication flow for n8n web portals using Google Sheets as a simple user/session store and email delivery for onboarding. It supports register, username/password login, one-click magic link auth, and a cookie-based profile page.\n\n### How it works\n1. User registers with an email address via a form\n2. n8n generates a username, password, and a one-time auth token\n3. User data is stored in Google Sheets\n4. n8n sends an email containing credentials + a one-click login link (`/auth?token=...`)\n5. User can log in with username/password or click the magic link\n6. `/auth` validates the token, creates a session id (sid), sets it as an HttpOnly cookie, and invalidates the token\n7. `/profile` reads the sid cookie, validates the session in Google Sheets, and displays user info to confirm login\n\n### Setup\n- Configure Gmail credentials in the Send email node\n- Create a Google Sheet with columns: username, password, role, token, sid\n- Add your Google Sheets URL (replace YOUR_SPREADSHEET_ID)\n- Replace YOUR_DOMAIN with your n8n instance domain in all nodes\n- Ensure your n8n instance is served over HTTPS so Secure cookies work\n\n### Customization\n- Adjust token expiry (e.g., 10-15 minutes) and one-time use behavior\n- Change session cookie settings (name, Max-Age, SameSite)\n- Customize the registration email content\n- Replace the Profile HTML with your own portal UI\n- Add a /logout endpoint to revoke sessions\n- Add rate-limiting at reverse proxy (Nginx/Traefik/Cloudflare)\n"
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $('Create password and token').item.json.email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
568,
320
],
"name": "Verify Email (BillionVerify)",
"credentials": {
"billionVerifyApi": {
"id": "",
"name": "BillionVerify account"
}
}
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "is-deliverable",
"leftValue": "={{ $json.is_deliverable }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
]
}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
748,
320
],
"name": "IF deliverable"
}
],
"connections": {
"Auth": {
"main": [
[
{
"node": "If has token",
"type": "main",
"index": 0
}
]
]
},
"Profile": {
"main": [
[
{
"node": "Check sid cookies header",
"type": "main",
"index": 0
}
]
]
},
"Search sid": {
"main": [
[
{
"node": "If has data with sid",
"type": "main",
"index": 0
}
]
]
},
"Prepare sid": {
"main": [
[
{
"node": "Redirect to profile and set cookies",
"type": "main",
"index": 0
},
{
"node": "Update sid",
"type": "main",
"index": 0
}
]
]
},
"If has token": {
"main": [
[
{
"node": "Search by token",
"type": "main",
"index": 0
}
],
[
{
"node": "Invalid token",
"type": "main",
"index": 0
}
]
]
},
"Prepare html": {
"main": [
[
{
"node": "Show profile page",
"type": "main",
"index": 0
}
]
]
},
"On form login": {
"main": [
[
{
"node": "Check username/password",
"type": "main",
"index": 0
}
]
]
},
"Generate token": {
"main": [
[
{
"node": "Add token to DB",
"type": "main",
"index": 0
}
]
]
},
"If token valid": {
"main": [
[
{
"node": "Prepare sid",
"type": "main",
"index": 0
}
],
[
{
"node": "Redirect to login form1",
"type": "main",
"index": 0
}
]
]
},
"Add token to DB": {
"main": [
[
{
"node": "Redirect to auth with new token",
"type": "main",
"index": 0
}
]
]
},
"Search by token": {
"main": [
[
{
"node": "If token valid",
"type": "main",
"index": 0
}
]
]
},
"If login success": {
"main": [
[
{
"node": "If has token in DB",
"type": "main",
"index": 0
}
],
[
{
"node": "Redirect to login form",
"type": "main",
"index": 0
}
]
]
},
"On form register": {
"main": [
[
{
"node": "Create password and token",
"type": "main",
"index": 0
}
]
]
},
"If has token in DB": {
"main": [
[
{
"node": "Redirect to auth url",
"type": "main",
"index": 0
}
],
[
{
"node": "Generate token",
"type": "main",
"index": 0
}
]
]
},
"If has data with sid": {
"main": [
[
{
"node": "Prepare html",
"type": "main",
"index": 0
}
],
[
{
"node": "Redirect to login",
"type": "main",
"index": 0
}
]
]
},
"Send username/password": {
"main": [
[
{
"node": "Notice register success",
"type": "main",
"index": 0
}
]
]
},
"Check username/password": {
"main": [
[
{
"node": "If login success",
"type": "main",
"index": 0
}
]
]
},
"Check sid cookies header": {
"main": [
[
{
"node": "Search sid",
"type": "main",
"index": 0
}
]
]
},
"Create password and token": {
"main": [
[
{
"node": "Append or update row in sheet",
"type": "main",
"index": 0
}
]
]
},
"Append or update row in sheet": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send username/password",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Authentica
Ready-to-use workflows that verify emails before Authentica sends.
How it works
- 1
Connect BillionVerify using the REST API or through an n8n workflow.
- 2
Trigger the verification step when a new user attempts to register via Authentica.
- 3
BillionVerify performs SMTP-level checks, disposable domain lookup, and catch-all detection.
- 4
Return the result to your workflow: allow registration for valid addresses, block or challenge invalid ones.
- 5
Log verification outcomes for audit trails and ongoing identity hygiene.
When to use this
Pre-Registration Email Check
Before a new identity is stored, call BillionVerify to confirm the supplied address is syntactically valid, exists at the mail server level, and isn't from a disposable provider.
Periodic Directory Hygiene
Run a scheduled workflow that pulls registered users and re-validates their emails with BillionVerify. Flag stale or undeliverable accounts for re-verification prompts or deactivation.
FAQ
Does BillionVerify send a confirmation email to the user?
No. BillionVerify silently checks the address using SMTP handshake and DNS lookups without ever sending a message, so the user experience is unaffected.
How accurate is disposable domain detection?
BillionVerify maintains a continuously updated list of known disposable and temporary email providers, catching the vast majority of throwaway addresses used in fake registrations.
Can I verify addresses in batches for existing users?
Yes. The BillionVerify bulk API accepts lists of addresses and returns structured results you can process to identify and act on problematic accounts.
Verify emails in Authentica
Create a free account, grab your API key, and stop bounces before they happen.
Get started free