curl --request POST \
  --url https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/custom-fields \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "some string",
  "position": 0,
  "permission": "1,2,3",
  "is_active": true,
  "object": "customer",
  "can_customer_view": true,
  "field_widget_id": 1,
  "settings": {
    "field_instance_id": 1,
    "allowed_values": [
      "value_1",
      "value_2"
    ],
    "default_value": "value_1"
  }
}
'

import requests

url = "https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/custom-fields"

payload = {
    "name": "some string",
    "position": 0,
    "permission": "1,2,3",
    "is_active": True,
    "object": "customer",
    "can_customer_view": True,
    "field_widget_id": 1,
    "settings": {
        "field_instance_id": 1,
        "allowed_values": ["value_1", "value_2"],
        "default_value": "value_1"
    }
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'some string',
    position: 0,
    permission: '1,2,3',
    is_active: true,
    object: 'customer',
    can_customer_view: true,
    field_widget_id: 1,
    settings: {
      field_instance_id: 1,
      allowed_values: ['value_1', 'value_2'],
      default_value: 'value_1'
    }
  })
};

fetch('https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/custom-fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "error": true,
  "errors": [
    "error message",
    "error message"
  ]
}

{
  "message": "Unauthorized"
}

{
  "message": "Request URL not found"
}

{
  "message": "Internal Server Error"
}