Twilio
Connect Twilio to Webflow forms and automate customer communications. Send SMS notifications, appointment reminders, and authentication codes via middleware.
How to integrate Twilio with Webflow
Twilio API credentials cannot be stored in Webflow custom code because they would appear in the browser source code. All production integrations require middleware to securely store credentials.
Three methods connect Webflow and Twilio. Automation platforms like Zapier or Make provide zero-code workflows. Twilio Functions offer serverless Node.js hosting for custom logic. Custom backend APIs give you maximum control over complex workflows.
Use automation platforms for rapid setup
Automation platforms connect Webflow form submissions to Twilio SMS and voice capabilities without writing code. According to Twilio-Webflow integration documentation, you configure workflows that trigger on Webflow events and automatically execute Twilio actions. Make (formerly Integromat) offers similar capabilities with more data transformation options, while n8n provides open-source flexibility for self-hosted deployment.
Some common automation workflows using Twilio and Webflow include:
- Send SMS when Webflow form is submitted: Configure Webflow form submission triggers to fire when users submit contact forms, then send SMS notifications via Twilio's Send SMS action through Zapier or Make
- Order confirmation messages from Webflow: Trigger SMS delivery when new Webflow e-commerce orders are placed using the New Order event
- Lead qualification alerts from Webflow forms: Filter Webflow form submissions by field values (budget, company size) before sending priority SMS alerts to sales teams
- Appointment reminders triggered by Webflow: Schedule follow-up SMS messages 24 hours before appointments using delay functions after Webflow booking form submissions
- Two-way messaging logs to Webflow CMS: Store incoming Twilio SMS responses in Webflow CMS collections using the Collection Items API for customer communication history
Build with Webflow and Twilio APIs
API-based integrations provide complete control over communication logic for custom workflows and multiple service integrations. All Twilio services use REST APIs with HTTP Basic authentication. Implement middleware to securely store credentials, since Webflow only executes client-side JavaScript.
Use Twilio Functions for serverless middleware
Twilio Functions provide Node.js serverless hosting specifically designed for Twilio integrations. Credentials stay in Twilio's secure environment without additional infrastructure. Configure Webflow forms to POST data to your Function's HTTPS endpoint, then the Function calls Twilio APIs with server-side credentials.
Implement it via the following steps:
- Create a Function in Twilio Console under Functions & Assets > Services
- Add environment variables for credentials (automatically includes Account SID and Auth Token)
- Write handler code using the Twilio Node.js SDK
- Deploy the Function to get a public HTTPS endpoint
- Configure Webflow form submission handling to POST to the Function URL
The common Function implementations include:
- Send SMS notifications: Call POST /Accounts/{AccountSid}/Messages with HTTP Basic Authentication to send SMS when receiving Webflow form data through a server-side middleware (Webflow's client-side-only architecture requires backend proxying for API credentials)
- Create verification checks: Use POST /Services/{ServiceSid}/Verifications to send OTP codes for two-factor authentication, supporting SMS, voice, WhatsApp, email, and TOTP channels. Note that full Twilio Verify API support requires Twilio Functions or custom backends rather than automation platforms.
- Initiate voice calls: Trigger POST /Accounts/{AccountSid}/Calls with TwiML instructions for automated calling and call recording
- Update Webflow CMS: Store Twilio interaction results (message delivery status, call duration, verification results) using the Webflow Collection Items API with OAuth token authentication.
The Functions include built-in context.getTwilioClient() helper providing authenticated Twilio SDK instances.
Deploy custom backend APIs
Custom backends offer maximum flexibility for complex integrations that require multiple service connections or complex business logic. Deploy serverless functions on AWS Lambda, Vercel, or Google Cloud Functions. Use OAuth tokens for the Webflow API access and Twilio API Keys for security.
The architecture pattern includes:
Webflow form submission → Custom API endpoint → Twilio API
↓
Webflow CMS API (to store results)
Never expose Account SID, Auth Token, or API Keys in client-side JavaScript. Use API Keys instead of Auth Tokens for production deployments because keys support rotation without changing core account credentials.
Validate webhook signatures
When receiving webhooks from Twilio (delivery receipts, incoming messages), validate the x-webflow-signature and x-webflow-timestamp header to prevent spoofing. Compute the expected signature using your Auth Token and compare it to the provided header value. The Twilio SDKs include validation helpers.
Twilio mandates HTTPS for all webhook URLs and explicitly rejects self-signed certificates. Use certificates issued by trusted authorities, such as Let's Encrypt or commercial certificate providers.
What you can build
Integrating Twilio with Webflow lets you build automated communication workflows triggered by website interactions.
- Appointment reminder systems: Capture appointment details through Webflow booking forms, then send automated SMS reminders 24 hours before scheduled times with calendar attachments and rescheduling links
- E-commerce order tracking: Online stores send order confirmations after checkout, shipping updates when items leave the warehouse, and delivery notifications with tracking links. Each message triggers when the Webflow order status changes
- Lead qualification pipelines: B2B sites send SMS notifications to sales representatives when leads submit contact forms. Automation platforms evaluate form field data (company size, budget indicators) and route urgent leads to multiple team members
- Two-factor authentication flows: Membership sites and SaaS applications use Twilio Verify API to send one-time codes during signup or login. Verification requests route through server-side middleware (Twilio Functions or custom backends) and store logs in the Webflow CMS for security auditing
Frequently asked questions
You cannot store Twilio credentials directly in Webflow, as any credentials placed in custom code are exposed in the browser's source code. All production integrations require middleware architecture using Twilio Functions, custom backend APIs, or automation platforms to keep credentials server-side.
Store credentials using environment variables or secure vaults on your server infrastructure. Configure Webflow forms to POST data to your secure endpoint, which then calls Twilio APIs. Use Twilio's IAM API Keys instead of Auth Tokens because keys support rotation and can be restricted to specific permissions.Twilio's APIs do not support CORS (Cross-Origin Resource Sharing) for direct browser requests. Browsers block direct Twilio API calls due to security policies. You must proxy requests through a server such as Twilio Functions with CORS headers configured.
For Twilio Functions handling requests from Webflow, add CORS headers to Function responses:
response.appendHeader('Access-Control-Allow-Origin', '*'); response.appendHeader('Access-Control-Allow-Methods', 'OPTIONS, POST, GET'); response.appendHeader('Access-Control-Allow-Headers', 'Content-Type');Replace
'*'with your Webflow site's domain for production deployments. All credentials (Account SID, Auth Token, API Keys) must remain server-side exclusively.SMS communications face strict regulatory requirements. US marketing messages must comply with TCPA, which requires express written consent before sending promotional SMS. Every message must include opt-out mechanisms (typically "Reply STOP to unsubscribe") and you must honor opt-out requests immediately.
GDPR applies to EU users and requires explicit consent for processing phone numbers. Implement consent management platforms or configure Webflow's tracking defaults to require user opt-in before collecting data. Store consent records with timestamps and consent language for audit compliance.
Healthcare use cases involving Protected Health Information require HIPAA compliance. You must sign a Business Associate Agreement (BAA) with Twilio and use HIPAA-eligible products. Standard Twilio accounts are not HIPAA-compliant by default.Webflow webhooks can trigger Twilio workflows through serverless functions or automation platforms. Twilio Studio flows expose webhook URLs that receive external data. Configure Webflow to POST form data to this URL.
Set up Webflow webhooks pointing to your Twilio integration endpoint. The form_submission event payload includes all form field values and submission data as JSON. Webflow secures requests with
x-webflow-timestampandx-webflow-signatureheaders that you must validate.
Description
Twilio is a cloud communications platform providing RESTful APIs for SMS, voice calling, WhatsApp messaging, video, and email integration. The platform offers pay-as-you-go pricing with SDKs for major programming languages and global infrastructure.
This integration page is provided for informational and convenience purposes only.
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