curl --request POST \
  --url https://panel.sendcloud.sc/api/v2/labels \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "label": {
    "parcels": [
      1,
      2,
      3
    ]
  }
}
'

{
  "label": {
    "normal_printer": [
      "https://panel.sendcloud.sc/api/v2/label/normal_printer?ids=1,2,3?start_from=0",
      "https://panel.sendcloud.sc/api/v2/label/normal_printer?ids=1,2,3?start_from=1",
      "https://panel.sendcloud.sc/api/v2/label/normal_printer?ids=1,2,3?start_from=2",
      "https://panel.sendcloud.sc/api/v2/label/normal_printer?ids=1,2,3?start_from=3"
    ],
    "label_printer": "https://panel.sendcloud.sc/api/v2/label/label_printer?ids=1,2,3"
  }
}