Service Plan IDs are used to authenticate when using the Sinch SMS API. When using the Send Batch operation of the SMS API, it is possible to send MMS messages to recipients by setting the type field to mt_media.
When using the standalone MMS API, MMS messages cannot be submitted through an SMS Service Plan ID. The standalone MMS API does not use Service Plan ID; it uses a separate MMS API key.
Visit the Sinch MMS product page to learn more about our MMS product.
