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MRC exposes a deliberately small, phone-number-first surface for compliance-grade texting. Three endpoints cover the whole MVP: Every request carries an OAuth Bearer token (OAuth Integration Guide) and your usage-plan x-api-key header. Start with the Integration Guide — it walks the canonical send → consent → poll → resend loop end to end, including the error model and polling cadence. The generated reference below it documents every field, sourced directly from the API’s own contract definitions.

Upcoming

  • Delivery status — GET on a sent message’s status by messageId.
  • Structured failure reason codes — an additive failureDetails[] alongside today’s human-readable failures[] strings.
  • Media (MMS) — fast-follow after the SMS launch.