{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/CardExpiration",
  "title": "CardExpiration",
  "type": "object",
  "description": "Card expiration date.",
  "properties": {
    "month": {
      "type": "string",
      "description": "Two-digit expiration month.",
      "pattern": "^(0[1-9]|1[0-2])$"
    },
    "year": {
      "type": "string",
      "description": "Two-digit expiration year.",
      "pattern": "^\\d{2}$"
    }
  }
}