Whatsauth

Open your app, ask for a phone number, and let Whatsauth handle the rest. You choose WhatsApp or SMS as the channel, generate a short-lived code or magic link, send it, then verify the token when the user replies or taps. The result is a clean, fast sign-in without passwords, security questions, or extra friction. Set timeouts, attempt limits, and fallback rules so users always have a way through while your team keeps full control of risk.

For new-user onboarding and returning logins, start with a simple flow: user enters phone, you call the API to create an OTP, and Whatsauth delivers a templated message on WhatsApp. If delivery stalls, auto-switch to SMS. The message can include both a tappable link and a 6‑digit code, so users pick whatever is easiest. On your side, verify the token, create the session, and bind it to the device fingerprint or browser if you want stronger continuity. Add resend after 30–45 seconds, cap attempts, and show a live countdown to set expectations. Track delivery, read receipts, and verification outcomes to tune copy, timing, and region-specific routing.

When you need step-up checks—like confirming a payout, changing a password, or adding a new device—trigger Whatsauth mid-session. Use a shorter expiry, increase the code length for sensitive actions, and require a fresh verification before proceeding. For support and operations teams, build a lightweight identity challenge into help flows: send a one-time code to confirm the account owner before making changes. If you serve global users, localize content and sender names, and route automatically to the best-performing channel by country. Keep fallback to SMS ready for users who don’t have WhatsApp active.

Ship faster with a few pragmatic guardrails. Use server-side generation and verification only; never trust codes in the client. Rate-limit by user, IP, and device; lock after too many attempts; and require a cool-down. Store minimal data, expire tokens quickly, and log only what you need for audits. Set up webhooks to receive sent/delivered/read events and verification status so you can trigger re-sends or show timely UI prompts. Run A/B tests on template wording and TTL to nudge completion rates. Finally, watch your cost and conversion per market: prioritize WhatsApp where it’s cheaper and more reliable, and keep SMS as a dependable backup. With these patterns, you’ll replace clunky passwords with a quick, secure, and budget-friendly flow users actually complete.