Implementing SMS Delivery Status Polling for Restaurant Waitlist Outage Alerts

Short answer: Choose an SMS API for critical outage alerts only if your backend can poll delivery status and own retry, escalation, cancellation, and timing logic; for restaurant waitlist updates, treat the provider as a delivery transport rather than as the incident workflow itself. The deciding constraint is delivery reliability. Sending a message is the easy part; deciding whether an unresolved alert should be polled again, resent, escalated through another channel, or canceled after recovery is where the application earns its reliability. An API that can send, expose status and events, resend, and cancel covers those transport mechanics. Without webhook pushes, however, the backend must run polling frequently enough for its actual alert deadline. This is a conditional yes, not a blanket recommendation. Timing dominates. How should you choose an SMS API for critical outage alerts? Start with an explicit service-level objective for the restaurant workflow. A waitlist delay notice might tolerate a polling interval that a critical app outage alert cannot. Write down the maximum time from initial send to the next decision, the point at which another attempt becomes stale, and the moment when recovery must suppress queued or repeat messages. If those values are missing, comparing provider feature lists produces a confident-looking choice with no reliability argument behind it. Four invariants matter here. Every accepted send needs an application-owned identifier; every retry must be bounded and idempotent; every delivery state must lead to a defined next action; and incident recovery must stop obsolete alerts. SMS cancel support helps with the last invariant, but cancellation is not permission to ignore timing: the application still has to notice recovery and issue the decision promptly. There is a hard boundary. No webhook event push means that delivery updates arrive only when the application asks for them, so a ten-second polling job cannot support a five-second es