curl --request POST \
  --url https://api.iotools.cloud/v1/tool/playfair-cipher \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mode": "encode",
  "inputText": "Hide the gold in the tree stump",
  "keyword": "playfair example",
  "matrixMode": "ij",
  "filler": "X"
}
'

{
  "tool": "playfair-cipher",
  "tool_version": "1.0.1",
  "outputs": {
    "output": "BM OD ZB XD NA BE KU DM UI XM MO UV IF"
  },
  "credits_used": 3,
  "credits_remaining": null
}