curl --request GET \
  --url https://api.contextual.ai/v1/extract/schemas/{schema_id} \
  --header 'Authorization: Bearer <token>'

{
  "schema_id": "<string>",
  "name": "<string>",
  "schema_definition": {},
  "metadata": {},
  "created_at": "<string>",
  "updated_at": "<string>",
  "description": "<string>"
}