curl --request GET \
  --url https://sandbox.layerfi.com/v1/businesses/{businessId}/categories \
  --header 'Authorization: Bearer <token>'

{
  "type": "Category_List",
  "categories": [
    {
      "type": "AccountNested",
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "stable_name": "EXPENSES",
      "display_name": "Expenses",
      "subCategories": [
        {}
      ]
    }
  ]
}