1) On ou website via https://lifesum.com/upgrade you have the option to pay via Paypal. Paypal offers the option to make payments using a linked bank account.

2) If you do not have a credit card or do not want to use it for online purchases you now have the option to purchase Lifesum Premium without a credit card on Android and iOS.

In iTunes, you have the option to purchase subscriptions by choosing the payment option mobile phone billing offered in the list of payment options (German: https://support.apple.com/de-de/HT205102)

In GooglePlay, you have the option to purchase subscriptions by choosing the payment option Direct carrier billing (payment by mobile phone bill) offered in the list of payment options.