curl --request POST \
  --url https://app.herondata.io/api/watermarks/logo \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "file_base64": "<string>",
  "filename": "<string>"
}
'

{
  "filename": "<string>",
  "user_id": "<string>"
}