curl --request POST \
  --url https://clarus-api.com/api/custom_carrier_types \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Clarus-Subdomain: <api-key>' \
  --data '
{
  "data": {
    "type": "custom_carrier_types",
    "attributes": {
      "name": "DPD Express",
      "code": "DPDEXP",
      "print_params": {
        "orientation": "portrait",
        "page_width": 100,
        "page_height": 150,
        "top": 5,
        "bottom": 5,
        "left": 5,
        "right": 5
      }
    }
  }
}
'

import requests

url = "https://clarus-api.com/api/custom_carrier_types"

payload = { "data": {
        "type": "custom_carrier_types",
        "attributes": {
            "name": "DPD Express",
            "code": "DPDEXP",
            "print_params": {
                "orientation": "portrait",
                "page_width": 100,
                "page_height": 150,
                "top": 5,
                "bottom": 5,
                "left": 5,
                "right": 5
            }
        }
    } }
headers = {
    "Authorization": "Bearer <token>",
    "X-Clarus-Subdomain": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    Authorization: 'Bearer <token>',
    'X-Clarus-Subdomain': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    data: {
      type: 'custom_carrier_types',
      attributes: {
        name: 'DPD Express',
        code: 'DPDEXP',
        print_params: {
          orientation: 'portrait',
          page_width: 100,
          page_height: 150,
          top: 5,
          bottom: 5,
          left: 5,
          right: 5
        }
      }
    }
  })
};

fetch('https://clarus-api.com/api/custom_carrier_types', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "data": {
    "id": "9",
    "type": "custom_carrier_types",
    "attributes": {
      "name": "DPD Express",
      "code": "DPDEXP",
      "print_params": {
        "orientation": "portrait",
        "page_width": 100,
        "page_height": 150
      }
    }
  }
}

{
  "error": "<string>"
}

{
  "errors": [
    {
      "code": 123,
      "symbol": "<string>",
      "details": "<string>",
      "source": "<string>",
      "context": {}
    }
  ]
}