curl --request GET \
  --url https://api.flexforward.com/labels/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "url": "https://label-cdn.yunexpress.cn/labels/YT2503010001.pdf",
  "labelFormat": "pdf"
}