{
  "type": "object",
  "properties": {
    "receipt_number": {
      "type": "string",
      "description": "The receipt's identifying number, labelled 'RECEIPT NO'"
    },
    "loyalty_membership_number": {
      "type": "string",
      "description": "The customer's loyalty program membership number, if the document mentions one."
    }
  },
  "required": [
    "receipt_number",
    "loyalty_membership_number"
  ]
}