How Startups Should Own Password-Reset SMS Logic Before Picking a Provider

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A technical guide argues that startups should keep password-reset templates, token expiry rules, and delivery-state logic within their own application code rather than delegating them to an SMS provider. The approach uses a narrow adapter layer to submit messages and retrieve delivery statuses, translating provider-specific responses into a small internal vocabulary. This separation makes SMS providers interchangeable without assuming uniform behaviour across services. The article also warns that US and EU sender-registration requirements differ and must be treated as distinct deployment prerequisites, not a unified global SMS path. A provider-agnostic code example is included to illustrate segment estimation, expiry enforcement, and finite delivery polling.

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