For all official invoices, you need to contact either Paddle or
FastSpring, whichever of our two official retailers charged your
card/PayPal account.
You can get in touch with either of these companies via their web sites:
Paddle - appears on card statement as PADDLE.NET* SITEARROW:
https://paddle.net
FastSpring - appears on card statement as FS* SITEARROW:
https://questionacharge.com