curl --request POST \
  --url https://api.iotools.cloud/v1/tool/vigenere-cipher \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputText": "Attack at dawn!",
  "key": "LEMON",
  "mode": "encode",
  "autoKey": ""
}
'

{
  "tool": "vigenere-cipher",
  "tool_version": "1.0.1",
  "outputs": {
    "output": "Lxfopv ef rnhr!",
    "frequency": [
      {
        "letter": "F",
        "count": "2",
        "frequency": "16.7%"
      },
      {
        "letter": "R",
        "count": "2",
        "frequency": "16.7%"
      },
      {
        "letter": "E",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "H",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "L",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "N",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "O",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "P",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "V",
        "count": "1",
        "frequency": "8.3%"
      },
      {
        "letter": "X",
        "count": "1",
        "frequency": "8.3%"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}