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DevOps & observability · #twilio
Decide between Twilio Verify and a custom OTP on Programmable Messaging for phone-number verification, with cost, fraud, and implementation trade-offs.
Decision guide for selecting Twilio Long Code, Toll-Free, or Short Code based on required MPS, target region, and A2P 10DLC regulations, with Messaging Service pooling example.
A step‑by‑step diagnostic guide for Twilio SMS messages stuck in queued or undelivered status, covering status callback validation, error code interpretation, sender health checks, content filtering fixes, and escalation thresholds.
Use Twilio Verify with SMS-to-voice fallback, a tuned OTP TTL, and rate-limit handling before enabling phone verification on your signup flow.
Anyone who discovers your Twilio webhook URL can forge inbound messages or status callbacks. Validate the X-Twilio-Signature HMAC over the exact public URL and sorted parameters, capture the raw body before middleware consumes it, and deduplicate on MessageSid or CallSid to survive replays.
Diagnose Twilio SMS messages that stay in "sent" or fail with error codes 30007 and 30003. Check carrier logs, StatusCallback webhooks, and A2P 10DLC compliance to pinpoint and resolve delivery issues.
Step‑by‑step diagnostic guide for Twilio Programmable SMS error 30004, covering symptoms, causes, ordered checks, fixes, escalation, and verification.
Use Twilio StatusCallback webhooks as primary delivery state and only poll Messages for recovery; avoid polling as sole mechanism.
Integrate a secure 2FA flow using the Twilio Verify API to send and validate one-time passcodes via SMS, including error handling and security best practices.
nodejs