Create a Promotion Category

curl --request POST \
  --url http://{defaultHost}/api/v2/platform/promotion_categories \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "promotion_category": {
    "name": "Promotions Used in 2021",
    "code": "2021-PROMOS"
  }
}'

{
  "data": {
    "id": "5",
    "type": "promotion_category",
    "attributes": {
      "name": "Promotion Category",
      "created_at": "2022-11-08T19:34:58.529Z",
      "updated_at": "2022-11-08T19:34:58.529Z",
      "code": "2021-BFM"
    },
    "relationships": {
      "promotions": {
        "data": []
      }
    }
  }
}