curl --request POST \
  --url https://api.iotools.cloud/v1/tool/collage-maker \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "images": "[\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGNgYPj/HwADAgH/5ncLrgAAAABJRU5ErkJggg==\",\"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/wAALCAABAAEBAREA/8QAFAABAAAAAAAAAAAAAAAAAAAAA//EABQQAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQEAAD8AfwD/2Q==\"]",
  "layout": "columns-2",
  "cellSize": "200",
  "spacing": "8",
  "cornerRadius": "0",
  "backgroundColor": "#ffffff"
}
'

{
  "tool": "collage-maker",
  "tool_version": "1.0.1",
  "outputs": {
    "svg": "<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 408 200\" width=\"408\" height=\"200\"><rect width=\"408\" height=\"200\" fill=\"#ffffff\"/><image href=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGNgYPj/HwADAgH/5ncLrgAAAABJRU5ErkJggg==\" x=\"0\" y=\"0\" width=\"200\" height=\"200\" preserveAspectRatio=\"xMidYMid slice\"/><image href=\"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/wAALCAABAAEBAREA/8QAFAABAAAAAAAAAAAAAAAAAAAAA//EABQQAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQEAAD8AfwD/2Q==\" x=\"208\" y=\"0\" width=\"200\" height=\"200\" preserveAspectRatio=\"xMidYMid slice\"/></svg>"
  },
  "credits_used": 3,
  "credits_remaining": null
}