Submits a message intended for per-destination personalization and/or multilingual content. This endpoint shares its base submission parameters with the standard bulk SMS API.

TODO: confirm with tech team — this endpoint isn't covered in the available specification. The parameters below are inferred only from the sample request URL and should be confirmed before publishing: - How multiple destinations are personalized (e.g. paired message

per destination, or a template with placeholders) is not documented.

• Whether additional parameters exist beyond those used by the
  standard bulk SMS endpoint is not documented.
• Response format and error codes for this endpoint are not documented;
  they may or may not match the standard bulk SMS endpoint.