One thing we've learned building notification systems: "sent" and "delivered" are two different facts, and most software only tracks the first one. That's why a customer swears they never got the confirmation while your dashboard insists it went out — the message left your server and quietly died somewhere on the way to WhatsApp, email, or a phone that had push turned off. We build these to record what actually landed, not just what we tried to send. How often does your team find out about a failed message from a customer rather than from a system?
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