curl --request PUT \
  --url https://api-next.ofauth.com/v2/access/mass-messages/:massMessageId \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <api-key>' \
  --header 'x-connection-id: <api-key>' \
  --data '
{
  "isForwardedMessage": false,
  "text": "",
  "mediaItems": [],
  "isLockedText": false,
  "price": 0,
  "previewMediaCount": 0,
  "releaseForms": {
    "users": [],
    "partners": [],
    "guests": []
  },
  "userTags": [],
  "isMarkdown": true,
  "scheduledDate": "<string>",
  "userIds": [
    1
  ],
  "userLists": [
    1
  ],
  "subscribedAfterDate": "<string>",
  "excludeUserLists": [
    1
  ]
}
'

{
  "id": 123,
  "date": "<string>",
  "isReady": true,
  "isDone": true,
  "total": 123,
  "pending": 123,
  "canUnsend": true,
  "unsendSeconds": 123,
  "hasError": true,
  "isCanceled": true,
  "isCouplePeopleMedia": true
}