You can use Paypal to donate using your own credit card. The payment is processed by PayPal but you don't need to have a PayPal account or sign-up for one if you are paying by credit card.
You can also use your own Paypal account to donate.
The swiss QGIS-user group is taking care of our bank account. Use the details below to make a donation via international money transfer:
Account name: QGIS User Group Switzerland BIC/SWIFT: MIGRCHZZ80A IBAN: CH87 0840 1000 0570 8858 6 Reference: Donation QGIS Currency: EUR Bank name: Migros Bank Branch name: Migros Bank Solothurn Bank address: Hauptgasse 49, 4502 Solothurn, Switzerland
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