curl --request GET \
  --url https://api.example.com/v1/projects/{project}/boxes/{name}/github/grants

{
  "grants": [
    {
      "created_at": "<string>",
      "name": "<string>",
      "permissions": {},
      "repositories": [
        "<string>"
      ],
      "updated_at": "<string>"
    }
  ]
}