{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/PaymentMethod",
  "title": "Payment method",
  "type": "string",
  "description": "Payment method used for the transaction, such as cash, credit card, bank transfer, or check",
  "nullable": true,
  "example": "cash"
}