curl --request POST \
  --url https://{organization}.rescueconsole.com/api/forms/{id}/fields \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "field_key": "person.phone",
  "label": "Best number to reach you",
  "required": true,
  "help_text": "We call between 9am and 5pm."
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    field_key: 'person.phone',
    label: 'Best number to reach you',
    required: true,
    help_text: 'We call between 9am and 5pm.'
  })
};

fetch('https://{organization}.rescueconsole.com/api/forms/{id}/fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{organization}.rescueconsole.com/api/forms/{id}/fields"

payload = {
    "field_key": "person.phone",
    "label": "Best number to reach you",
    "required": True,
    "help_text": "We call between 9am and 5pm."
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "field": {
    "id": "<string>",
    "field_key": "<string>",
    "label": "<string>",
    "field_type": "text",
    "options": [
      "<string>"
    ],
    "required": true,
    "help_text": "<string>",
    "sort_order": 123
  }
}

{
  "error": "house_trained must be 1, 0 or null (not assessed)"
}

{
  "error": "house_trained must be 1, 0 or null (not assessed)"
}

{
  "error": "house_trained must be 1, 0 or null (not assessed)"
}

{
  "error": "house_trained must be 1, 0 or null (not assessed)"
}

{
  "error": "house_trained must be 1, 0 or null (not assessed)"
}