curl --request POST \
  --url https://api.iotools.cloud/v1/tool/image-placeholder-generator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "width": "800",
  "height": "600",
  "bgType": "solid",
  "bgColor": "#cccccc",
  "gradientStart": "#667eea",
  "gradientEnd": "#764ba2",
  "gradientAngle": "135",
  "customText": "",
  "text": "",
  "textColor": "#666666",
  "fontSize": "48",
  "showBorder": "",
  "borderColor": "#999999",
  "borderWidth": "4"
}
'

{
  "tool": "image-placeholder-generator",
  "tool_version": "1.0.1",
  "outputs": {
    "svg": "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"800\" height=\"600\" viewBox=\"0 0 800 600\"><rect width=\"800\" height=\"600\" fill=\"#cccccc\"/><text x=\"400\" y=\"300\" fill=\"#666666\" font-family=\"Arial, Helvetica, sans-serif\" font-size=\"48\" font-weight=\"bold\" text-anchor=\"middle\" dominant-baseline=\"middle\">800 × 600</text></svg>"
  },
  "credits_used": 3,
  "credits_remaining": null
}