curl --request POST \
  --url https://api.ofauth.com/v2/access/uploads/init \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <api-key>' \
  --header 'x-connection-id: <api-key>' \
  --data '
{
  "filename": "<string>",
  "size": 1,
  "contentType": "<string>",
  "vaultUpload": {
    "mode": "message",
    "userId": "<string>"
  }
}
'

{
  "mediaUploadId": "<string>",
  "totalParts": 1,
  "partSize": 1,
  "expiresAt": "<string>",
  "parts": [
    {
      "partNumber": 1,
      "uploadUrl": "<string>",
      "byteRange": {
        "start": 1,
        "end": 1
      }
    }
  ],
  "completeUrl": "<string>"
}