curl --request POST \
  --url https://api.iotools.cloud/v1/tool/string-obfuscator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "stringToObfuscate": "john.doe@example.com",
  "keepFirst": "4",
  "keepLast": "4",
  "keepSpaces": "true",
  "keepCharacters": ""
}
'

{
  "tool": "string-obfuscator",
  "tool_version": "1.0.1",
  "outputs": {
    "obfuscatedString": "john************.com"
  },
  "credits_used": 3,
  "credits_remaining": null
}