An online service sends login codes via Telegram first because it's the cheapest option. If the code doesn't arrive there, a voice call and an SMS follow automatically…
An online service with users across Europe sends a verification code by SMS at every login. As the user base grew, the cost of two-factor authentication rose sharply. But the team didn't want to drop SMS entirely, because every user must reliably receive their code.
The service now uses Verify Codes from LOX24 with a fixed channel order. The code is sent via Telegram first because it's the cheapest option. If Telegram doesn't confirm delivery within 30 seconds, the system calls the user and reads the code aloud. SMS follows as the final step.
Sign up for free and try it out with 50 cents of starting credit. For custom projects, email us at berlin@lox24.eu.
