curl --request GET \
  --url https://api.joinslash.com/card-group/{cardGroupId} \
  --header 'X-API-Key: <api-key>'

{
  "id": "<string>",
  "name": "<string>",
  "virtualAccountId": "<string>",
  "spendingConstraint": {
    "merchantCategoryRule": {
      "merchantCategories": [
        "<string>"
      ],
      "restriction": "allowlist"
    },
    "merchantRule": {
      "merchants": [
        "<string>"
      ],
      "restriction": "allowlist"
    },
    "spendingRule": {
      "utilizationLimit": {
        "timezone": "<string>",
        "limitAmount": {
          "amountCents": 123
        },
        "preset": "daily",
        "startDate": "<string>"
      },
      "utilizationLimitV2": [
        {
          "timezone": "<string>",
          "limitAmount": {
            "amountCents": 123
          },
          "preset": "daily",
          "startDate": "<string>"
        }
      ],
      "transactionSizeLimit": {
        "minimum": {
          "amountCents": 123
        },
        "maximum": {
          "amountCents": 123
        }
      }
    },
    "countryRule": {
      "countries": [
        "<string>"
      ],
      "restriction": "allowlist"
    },
    "merchantCategoryCodeRule": {
      "merchantCategoryCodes": [
        "<string>"
      ],
      "restriction": "allowlist"
    }
  }
}