QPayQrCode(qrText: invoice.qrText)

QPayPaymentSheet.show(
  context,
  qrText: invoice.qrText,
  banks: invoice.urls.map((u) => QPayBankItem(
    name: u.name,
    logo: u.logo,
    link: u.link,
  )).toList(),
);

QPayPaymentButton(
  qrText: invoice.qrText,
  banks: bankItems,
)

final poller = PaymentPoller(
  checker: (id) async {
    final result = await client.checkPayment(...);
    return result.rows.isNotEmpty;
  },
);
final paid = await poller.poll(invoice.invoiceId);