curl --request POST \
  --url https://api.iotools.cloud/v1/tool/word-combiner \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "wordList1": "cat\ndog",
  "wordList2": "food\ntoy",
  "showList3": "",
  "wordList3": "",
  "showList4": "",
  "wordList4": "",
  "separator": "-",
  "customSeparator": ""
}
'

{
  "tool": "word-combiner",
  "tool_version": "1.0.1",
  "outputs": {
    "count": "4",
    "output": "cat-food\ncat-toy\ndog-food\ndog-toy"
  },
  "credits_used": 3,
  "credits_remaining": null
}