Create a custom user-level category

curl --request POST \
  --url https://east.sandbox.spade.com/users/{userId}/categories \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '{
  "name": "Kitchen Remodel",
  "parentId": "011-000-000-000"
}'

{
  "id": "4d5419f1-bcde-40f5-9168-7f8989b9c55f",
  "name": "Kitchen Remodel",
  "icon": "https://static.v2.spadeapi.com/categories/ee4ee39fd5474d31ac42f9e606b9040a/light.png",
  "fullCategoryHierarchy": [
    {
      "id": "011-000-000-000",
      "name": "Retail",
      "icon": "https://static.v2.spadeapi.com/categories/ee4ee39fd5474d31ac42f9e606b9040a/light.png"
    },
    {
      "id": "4d5419f1-bcde-40f5-9168-7f8989b9c55f",
      "name": "Kitchen Remodel",
      "icon": "https://static.v2.spadeapi.com/categories/ee4ee39fd5474d31ac42f9e606b9040a/light.png"
    }
  ]
}