curl --request POST \
  --url https://api-dev.narrative.io/admin/products/add-permission \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "permission_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "error": "Unauthorized",
  "error_description": "You are not authorized to use this endpoint."
}