SMS object

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{
    "subscription_group_id": (required, string) the id of your subscription group,
    "message_variation_id": (optional, string) used when providing a campaign_id to specify which message variation this message should be tracked under,
    "body": (required, string),
    "app_id": (required, string) see App Identifier,
    "media_items" :(optional, array) use this field to pass an image URL in an MMS to send an image with your message.    
}