Reveal publishable key

curl --request POST \
  --url https://app.usechar.ai/api/publishable-keys/reveal \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "key_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "key": "<string>"
}