For easier mobile payment with mobile banking apps, please generate a QR code for bank transfers and display it on the donate page.
They are called EPC-QR-Code:
and could contain next to
Recipient deSEC e.V.
IBAN DE91 8306 5408 0004 1580 59
BIC GENODEF1SLR
also a “Verwendungszweck” e.g. “Spende/Donation for deSEC e.V.”
and maybe a decent proposal for “Zahlungsbetrag”, based on usually received donations ? But this field is optional and can be omitted in the QR code.