Login verification
Confirm identity when a customer signs in or uses a new device.
OTP Messages
OTP messaging for secure verification
Deliver one-time passcodes for login, onboarding and account recovery with fast, reliable application-to-person messaging.
Overview
What is OTP messaging?
OTP messaging sends a one-time passcode to a customer’s phone for verification. It is commonly used for login, account recovery, payments and other high-risk actions.
SMS codes reach customers on the device they are already using. Delivery speed and conversion depend on the destination, carrier and number type.
A well-designed OTP flow combines clear consent, rate limiting, code expiry and fallback options.
Time-limitedOne-time codes
APISystem-triggered
Multi-marketDelivery options
Use Cases
Where OTP messages fit
Verify customers at the moments that matter most.
Account recovery
Help customers regain access without weakening account security.
Payment confirmation
Verify high-risk actions such as payments or profile changes.
Onboarding
Confirm phone ownership during registration and onboarding.
Features
Built for security and delivery control
API integration
Trigger codes from your application, CRM or identity platform.
Code policy controls
Set code length, expiry and one-time-use rules.
Rate limiting
Apply resend cooldowns and attempt limits to reduce abuse.
Delivery reporting
Track delivery and failure events for support and monitoring.
Fallback options
Use voice or another channel where available and appropriate.
Fraud monitoring
Watch unusual traffic patterns and protect your sender reputation.
How It Works
From request to verification
Request a code
Your application triggers a request when verification is needed.
Generate and send
Create a time-limited code and deliver it through the selected channel.
Verify
Check the code, apply retry limits and expire it after use.
Monitor and retry
Track delivery events and offer a controlled resend or fallback.
Security & Compliance
Protect the verification flow
OTP messages are security-sensitive. Build the flow around consent, limits and monitoring.
Before you launch, review the following controls:
- Use clear consent and explain why the code is being sent.
- Apply rate limits, short expiry windows and one-time use.
- Do not include sensitive data in the message.
- Complete the registration required by the number type you use.
- Monitor fraud patterns, delivery failures and unusual traffic.
Requirements vary by market, carrier and number type. Confirm your OTP flow with your security and compliance teams.
FAQ
Common questions about OTP messaging
Which countries are supported?
Coverage depends on number types and carrier resources. Tell us your target markets and we will confirm available routes.
How fast are OTP messages delivered?
Delivery time depends on the destination, carrier and number type. We can review current routing during onboarding.
How long should a code last?
Use a short expiry window and one-time use. Confirm the policy that fits your risk model.
Can I resend a code?
Yes, with rate limits and cooldowns to prevent abuse.
Do I need registration?
Some number types, including US 10DLC, require brand and campaign registration. We can confirm the requirements for your markets.
Can I use voice as a fallback?
Yes, where voice messaging is available. See Voice Messages for fallback options.
Get Started
Plan your OTP flow
Tell us about your use case, target markets and expected volume. We will help you review numbers, routing and verification controls.