curl --request PATCH \
  --url https://{your-subdomain}.neetokb.com/api/external/v2/themes/{theme_id}/configuration \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <x-api-key>' \
  --data '
{
  "configuration": {
    "title_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "body_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "brand_image_height": 123,
    "custom_css": "<string>",
    "colors": {
      "header-bg": "#000000"
    },
    "brand_image": "<string>",
    "header_image": "<string>"
  }
}
'

const options = {
  method: 'PATCH',
  headers: {'X-Api-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    configuration: {
      title_font_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
      body_font_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
      brand_image_height: 123,
      custom_css: '<string>',
      colors: {'header-bg': '#000000'},
      brand_image: '<string>',
      header_image: '<string>'
    }
  })
};

fetch('https://{your-subdomain}.neetokb.com/api/external/v2/themes/{theme_id}/configuration', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{your-subdomain}.neetokb.com/api/external/v2/themes/{theme_id}/configuration"

payload = { "configuration": {
        "title_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "body_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "brand_image_height": 123,
        "custom_css": "<string>",
        "colors": { "header-bg": "#000000" },
        "brand_image": "<string>",
        "header_image": "<string>"
    } }
headers = {
    "X-Api-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "configuration": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "title_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "body_font_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "title_font_name": "<string>",
    "body_font_name": "<string>",
    "colors": {},
    "brand_image_height": 30,
    "custom_css": "<string>",
    "brand_image_url": "<string>",
    "header_image_url": "<string>",
    "typographs": [
      {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "name": "Roboto",
        "weights": "400,700"
      }
    ]
  }
}

{
  "error": "Not found."
}

{
  "error": "Built-in themes cannot be changed. Clone the theme to get one that can."
}