One recipient of a template send (canonical name TemplateResult).
message_id- a string;nilunless the message was queued (or, with reason"DUPLICATE_MSG_REF", the original message's id).to,user_reference_id- strings: a rejected recipient echoes what the request sent, converted to a string.status-"ACKNOWLEDGED"or"REJECTED"(open).reason- why it was rejected (open; for example"INVALID_NUMBER");nilwhen accepted.category- the template's category.raw,extra- the JSON object, and the members this version does not model.