1. What is OTP Engine?

OTP Engine is a powerful API platform that allows you to send One-Time Passwords (OTPs) via WhatsApp and SMS instantly and securely.

2. How does OTP Engine work?

You integrate our API with your system, then use a simple POST request to send OTP messages to your users. We handle the delivery, tracking, and retry mechanisms.

3. Do I need a WhatsApp Business Account?

Yes. To send OTP via WhatsApp, your number must be registered and verified through WhatsApp Business API (WABA). We support onboarding or you can use your own WABA setup.

4. Can I send OTP via SMS too?

Yes. We support multi-channel delivery. If WhatsApp fails or is not available, fallback to SMS is optional and configurable.

5. Is there a message limit per day?

By default, WhatsApp allows 250 conversations per day for new numbers. This increases with trust score. SMS has no fixed cap but depends on your gateway balance.

6. How do I integrate the API?

You can use our RESTful API with any backend: .NET, Node.js, PHP, etc. We provide clear documentation and SDK examples upon registration.

7. How secure is OTP Engine?

We use HTTPS, access tokens, and optional IP whitelisting. All messages are logged temporarily for delivery trace only. No personal data is stored.

8. What are the pricing options?

We offer flexible pricing based on usage volume. Contact us at [email protected] for custom plans or startup discounts.

9. Do you support international numbers?

Yes, we support global delivery. Ensure that your phone number format includes the correct country code (e.g., +62 for Indonesia).

10. Where can I get help or support?

Our team is ready to help via email, Telegram, or live chat. You can also access full docs at docs.lvlotpengine.com.