curl --request POST \
  --url https://api.iotools.cloud/v1/tool/base64url-encoder-decoder \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputText": "subjects?_d=1",
  "mode": "encode",
  "padding": "false"
}
'

{
  "tool": "base64url-encoder-decoder",
  "tool_version": "1.0.2",
  "outputs": {
    "output": "c3ViamVjdHM_X2Q9MQ"
  },
  "credits_used": 5,
  "credits_remaining": null
}