July 2025 Summaries

WhatsApp OTP (One-Time Password) has emerged as a preferred method for user verification over traditional SMS due to its speed, reliability, and security features. Unlike SMS, which can face delivery issues and security vulnerabilities such as SIM swapping, WhatsApp offers near-instant message delivery with end-to-end encryption and a familiar user interface. Implementing WhatsApp OTP involves using a secure backend, a verified Meta Business Account, and pre-approved message templates to ensure compliance with strict WhatsApp policies. This method not only enhances user experience by reducing friction in the authentication process but also provides developers with advanced analytics and fewer support issues. While scaling the OTP process, it is crucial to adhere to WhatsApp's rate limits and opt-in policies to maintain service reliability and avoid potential throttling. Prelude offers services to integrate and optimize WhatsApp OTP flows, ensuring fast and secure transactional messaging.

Prelude has introduced Telegram as a new channel for delivering one-time password (OTP) verification codes, enhancing its array of messaging options that already includes SMS, WhatsApp, Viber, RCS, Voice OTP, and Zalo. This addition leverages Telegram's widespread global usage, particularly in regions like India, Russia, Southeast Asia, and Latin America, where it has seen substantial growth. The integration with Prelude's smart routing engine allows for automatic channel optimization based on delivery rates and user preferences, while users can also prioritize Telegram by configuring their API requests. Telegram's inclusion offers a cost-effective, reliable alternative to SMS, particularly in areas with unreliable SMS delivery, and is available at a flat rate of €0.0120 per message without tiered pricing, enhancing flexibility and reach for Prelude customers.