content: {
    "$defs": {
      "Advance": {
        "description": "Advance represents a single payment that has been made already, such as a deposit on an intent to purchase, or as credit from a previous invoice which was later corrected or cancelled.",
        "properties": {
          "amount": {
            "$ref": "https://gobl.org/draft-0/num/amount",
            "description": "How much was paid.",
            "title": "Amount"
          },
          "card": {
            "$ref": "#/$defs/Card",
            "description": "Details of the payment that was made via a credit or debit card.",
            "title": "Card"
          },
          "credit_transfer": {
            "$ref": "#/$defs/CreditTransfer",
            "description": "Details about how the payment was made by credit (bank) transfer.",
            "title": "Credit Transfer"
          },
          "currency": {
            "$ref": "https://gobl.org/draft-0/currency/code",
            "description": "If different from the parent document's base currency.",
            "title": "Currency"
          },
          "date": {
            "$ref": "https://gobl.org/draft-0/cal/date",
            "description": "When the advance was made.",
            "title": "Date"
          },
          "description": {
            "description": "Details about the advance.",
            "title": "Description",
            "type": "string"
          },
          "grant": {
            "description": "If this \"advance\" payment has come from a public grant or subsidy, set this to true.",
            "title": "Grant",
            "type": "boolean"
          },
          "key": {
            "$ref": "https://gobl.org/draft-0/cbc/key",
            "anyOf": [
              {
                "const": "any",
                "description": "Any method available, no preference.",
                "title": "Any"
              },
              {
                "const": "card",
                "description": "Payment card.",
                "title": "Card"
              },
              {
                "const": "credit-transfer",
                "description": "Sender initiated bank or wire transfer.",
                "title": "Credit Transfer"
              },
              {
                "const": "debit-transfer",
                "description": "Receiver initiated bank or wire transfer.",
                "title": "Debit Transfer"
              },
              {
                "const": "cash",
                "description": "Cash in hand.",
                "title": "Cash"
              },
              {
                "const": "cheque",
                "description": "Cheque from bank.",
                "title": "Cheque"
              },
              {
                "const": "bank-draft",
                "description": "Bankers Draft or Bank Cheque.",
                "title": "Draft"
              },
              {
                "const": "direct-debit",
                "description": "Direct debit from the customers bank account.",
                "title": "Direct Debit"
              },
              {
                "const": "online",
                "description": "Online or web payment.",
                "title": "Online"
              },
              {
                "const": "promissory-note",
                "description": "Promissory note contract.",
                "title": "Promissory Note"
              },
              {
                "const": "netting",
                "description": "Intercompany clearing or clearing between partners.",
                "title": "Netting"
              },
              {
                "const": "other",
                "description": "Other or mutually defined means of payment.",
                "title": "Other"
              },
              {
                "pattern": "^(?:[a-z]|[a-z0-9][a-z0-9-+]*[a-z0-9])$",
                "title": "Regime Specific Key"
              }
            ],
            "description": "The payment means used to make the advance.",
            "title": "Key"
          },
          "meta": {
            "$ref": "https://gobl.org/draft-0/cbc/meta",
            "description": "Additional details useful for the parties involved.",
            "title": "Meta"
          },
          "percent": {
            "$ref": "https://gobl.org/draft-0/num/percentage",
            "description": "How much as a percentage of the total with tax was paid",
            "title": "Percent"
          },
          "ref": {
            "description": "ID or reference for the advance.",
            "title": "Reference",
            "type": "string"
          },
          "uuid": {
            "description": "Universally Unique Identifier.",
            "format": "uuid",
            "title": "UUID",
            "type": "string"
          }
        },
        "required": [
          "description",
          "amount"
        ],
        "type": "object"
      },
      "Card": {
        "description": "Card contains simplified card holder data as a reference for the customer.",
        "properties": {
          "holder": {
            "description": "Name of the person whom the card belongs to.",
            "title": "Holder Name",
            "type": "string"
          },
          "last4": {
            "description": "Last 4 digits of the card's Primary Account Number (PAN).",
            "title": "Last 4",
            "type": "string"
          }
        },
        "required": [
          "last4",
          "holder"
        ],
        "type": "object"
      },
      "CreditTransfer": {
        "description": "CreditTransfer contains fields that can be used for making payments via a bank transfer or wire.",
        "properties": {
          "bic": {
            "description": "Bank Identifier Code used for international transfers.",
            "title": "BIC",
            "type": "string"
          },
          "branch": {
            "$ref": "https://gobl.org/draft-0/org/address",
            "description": "Bank office branch address, not normally required.",
            "title": "Branch"
          },
          "iban": {
            "description": "International Bank Account Number",
            "title": "IBAN",
            "type": "string"
          },
          "name": {
            "description": "Name of the bank.",
            "title": "Name",
            "type": "string"
          },
          "number": {
            "description": "Account number, if IBAN not available.",
            "title": "Number",
            "type": "string"
          }
        },
        "type": "object"
      }
    },
    "$id": "https://gobl.org/draft-0/pay/advance",
    "$ref": "#/$defs/Advance",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }