{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/CreditCardDetails",
  "title": "CreditCardDetails",
  "type": "object",
  "description": "Details of the credit or debit card used in a transaction, with sensitive fields masked.",
  "properties": {
    "bin": {
      "type": "string",
      "description": "First six digits of the card number identifying the issuing bank.",
      "pattern": "^\\d{6}$"
    },
    "last_4": {
      "type": "string",
      "description": "Last four digits of the card number.",
      "pattern": "^\\d{4}$"
    },
    "card_type": {
      "type": "string",
      "description": "The card network or type, such as Visa, MasterCard, American Express, or Discover."
    },
    "expiration_month": {
      "type": "string",
      "description": "Two-digit expiration month of the card.",
      "pattern": "^\\d{2}$"
    },
    "expiration_year": {
      "type": "string",
      "description": "Four-digit expiration year of the card.",
      "pattern": "^\\d{4}$"
    },
    "cardholder_name": {
      "type": "string",
      "description": "Name of the cardholder as it appears on the card."
    },
    "country_of_issuance": {
      "type": "string",
      "description": "Two-letter ISO 3166-1 country code of the card-issuing country."
    }
  }
}