OTP verification stops fake sign-ups and secures logins. Adding it to your website or app is straightforward with a good API. Here is the flow using Pak Sender.
How OTP Verification Works
When a user enters their number, your server requests a code, the user receives it, and they enter it back to prove ownership of the number. Your server checks the code and grants access.
The Basic Steps
- Generate or request a one-time code when the user submits their number.
- Send it via the Pak Sender API over SMS, Voice or WhatsApp.
- Store the code securely with a short expiry.
- Verify the code the user enters, then expire it.
Calling the API
Pak Sender exposes a simple REST API with your API key. A single request sends the message; the response confirms it was queued. The interactive API Tester and docs show ready-made examples in cURL, PHP, Python, Node.js and more.
Best Practices
Keep codes short-lived, limit retries, and offer a fallback channel. With Pak Sender's multi-channel delivery, you can make verification both secure and reliable.
Do It All with Pak Sender
Pak Sender brings Bulk SMS, Branded Sender ID, Voice OTP, WhatsApp Business, Email campaigns, automated invoices and a full REST API together in one account. Whether you are a shop, a school, a startup or a developer, you get the same reliable platform and the same honest pricing. Start today and grow your reach.