Where can I find invoices for purchases made with Apple Pay/Google Pay?

Invoices for purchases made via Apple Pay or Google Pay are issued and available directly through the systems of these payment providers.

Apple Pay – you can find information about invoices here (see the “VAT and invoicing” section):
https://www.apple.com/uk/shop/help/payments 

Google Pay – information about invoices is available here:
https://support.google.com/googlepay/answer/7644144?hl=en 

Errors and issues

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How do I launch the SuperMemo UX program? Is it supported?

Where can I find invoices for purchases made with Apple Pay/Google Pay?

What to do if recordings in courses differ across platforms?

I have a SuperMemo course on a CD with the SuperMemo UX program that I can't install. What can I do in this situation?

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Is there technical support for users?

How to report an error or suggestion to the SuperMemo team?