Further payment options needed for international users

### Problem

Hi! I am from Germany. Credit cards are way less common here than in the USA. I really like elementary as a project and would love to be able to support it - both by being able to purchase the iso for the OS and applications in the appcenter - but I do not own a credit card and refuse to own one. I am confident that culturally, this is a common case here in Germany. I assume that your very limited payment options are limiting your business internationally.
I am aware of the possibility of directly donating to you via PayPal and have done so. However, I can not purchase applications in the appcenter, if I wanted to pay for them. And it feels bad to download the iso for 0$ when I want to actually support the download financially.

### Proposal

Please add both PayPal and Amazon Payments as payment options to the appcenter and website.
This will enable more people to comfortably support your project and use the website and appcenter as you intend it.

### Prior Art (Optional)

_No response_