issueInvoice method
Implementation
Future<IssueResult> issueInvoice(IssueInvoiceRequest anfrage) async {
const name = Aufrufe.issueInvoice;
final daten = await _transport.rufen(name, anfrage.toJson());
return _lesen(name, () => IssueResult(
invoice: Invoice.fromJson(_objekt(daten, 'invoice')),
replayed: daten['replayed'] == true,
notice: _hinweise(daten['notice']),
));
}