curl --request POST \
  --url https://api.iotools.cloud/v1/tool/punycode-converter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputText": "münchen.de",
  "mode": "encode",
  "fullDomain": "true"
}
'

{
  "tool": "punycode-converter",
  "tool_version": "1.0.1",
  "outputs": {
    "output": "xn--mnchen-3ya.de",
    "breakdown": [
      {
        "original": "münchen",
        "converted": "xn--mnchen-3ya"
      },
      {
        "original": "de",
        "converted": "de"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}