e96ef4c5a3
The mark-paid dialog offered Cash / Card / PayPal / TWINT but not bank transfer — the default method for the QR-bill / IBAN invoices picpeak issues (createInvoice even falls back to 'bank_transfer'). Added it as the first option. Backend already accepts paymentMethod as a free string, so no API change; i18n bills.payment.methods.bankTransfer (de "Überweisung").