curl --request POST \
  --url https://api.iotools.cloud/v1/tool/css-gradient-generator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "gradientType": "linear",
  "angle": "90",
  "color1": "#ff0000",
  "position1": "0",
  "color2": "#0000ff",
  "position2": "100",
  "useColor3": "",
  "color3": "#ff6b6b",
  "position3": "50"
}
'

{
  "tool": "css-gradient-generator",
  "tool_version": "1.0.1",
  "outputs": {
    "cssCode": "background: linear-gradient(90deg, #ff0000 0%, #0000ff 100%);"
  },
  "credits_used": 3,
  "credits_remaining": null
}