payer property
Payer is the payer ORG — the tenant whose ledger was debited — and not an address. It is the org the request was authenticated as, so it answers who is billed, which the payer address alone cannot.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? payer;