curl --request PATCH \
  --url https://realtime-api.voiceflow.com/v1/stable/function-variable/{variableID} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "description": "<string>"
}
'

{
  "message": "<string>"
}