Trigger a saved event template for one or more recipients, on SMS or WhatsApp streams. Identify the template with event (its eventKey) and pass each recipient's values in template_variables.
Defaults and overrides. Set sender and event once at the top level, on every recipient, or both: a recipient's own value wins. For WhatsApp Business templates with header or button variables, use WhatsApp template.
Response. HTTP 200 with a task_id and one entry per message. status is false when any message failed: failed entries come first and carry error (hex code) and details; accepted entries carry message_uuid (and conversation_uuid on two-way channels). Match entries by internal_id. Final delivery status is sent asynchronously to your configured webhook.
Authentication: stream token in the Authorization header (see Authentication in the API Overview).
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