curl --request DELETE \
  --url https://api-next.ofauth.com/v2/access/mass-messages/:massMessageId \
  --header 'apiKey: <api-key>' \
  --header 'x-connection-id: <api-key>'

{
  "success": true,
  "queue": {
    "id": 123,
    "text": "<string>",
    "fromUser": {
      "id": 123,
      "name": "<string>"
    },
    "media": [
      {
        "id": 123,
        "type": "photo",
        "convertedToVideo": true,
        "canView": true,
        "hasError": true,
        "createdAt": "<string>",
        "isReady": true,
        "releaseForms": [
          {
            "id": 123,
            "name": "<string>",
            "partnerSource": "<string>",
            "type": "<string>",
            "user": {
              "view": "<string>",
              "id": 123,
              "name": "<string>",
              "username": "<string>",
              "isVerified": true,
              "avatar": "<string>",
              "avatarThumbs": {
                "c50": "<string>",
                "c144": "<string>"
              },
              "ivStatus": "<string>",
              "isFromGuest": true
            }
          }
        ],
        "duration": 123,
        "hasCustomPreview": true,
        "videoSources": {
          "240": "<string>",
          "720": "<string>"
        },
        "files": {
          "full": {
            "url": "<string>",
            "sources": [
              {
                "url": "<string>",
                "width": 123,
                "height": 123,
                "type": "<string>"
              }
            ],
            "width": 123,
            "height": 123,
            "size": 123
          },
          "thumb": {
            "url": "<string>",
            "width": 123,
            "height": 123,
            "size": 123
          },
          "preview": {
            "url": "<string>",
            "options": [
              {
                "url": "<string>",
                "width": 123,
                "height": 123,
                "type": "<string>"
              }
            ],
            "width": 123,
            "height": 123,
            "size": 123
          },
          "squarePreview": {
            "url": "<string>",
            "width": 123,
            "height": 123,
            "size": 123
          }
        }
      }
    ],
    "previews": [
      123
    ],
    "isMediaReady": true,
    "mediaCount": 123,
    "lockedText": true,
    "responseType": "<string>",
    "giphyId": "<string>",
    "isFree": true,
    "isTip": true,
    "isReportedByMe": true,
    "isCouplePeopleMedia": true,
    "queueId": 123,
    "isMarkdownDisabled": true,
    "releaseForms": "<unknown>",
    "isFromQueue": true,
    "canUnsendQueue": true,
    "unsendSecondsQueue": 123,
    "isOpened": true,
    "isNew": true,
    "createdAt": "<string>",
    "changedAt": "<string>",
    "cancelSeconds": 123,
    "isLiked": true,
    "canPurchase": true,
    "canPurchaseReason": "<string>",
    "canReport": true,
    "canBePinned": true,
    "isPinned": true,
    "date": "<string>",
    "textCropped": "<string>",
    "sentCount": 123,
    "viewedCount": 123,
    "canUnsend": true,
    "unsendSeconds": 123,
    "isCanceled": true,
    "mediaTypes": {
      "video": 123,
      "photo": 123,
      "gif": 123,
      "audio": 123
    },
    "hasError": true,
    "price": "<string>",
    "purchasedCount": 123,
    "canSendMessageToBuyers": true
  }
}