The only way to donate is via Paypal. However, as a Chinese user , I want to donate via Wechat or Alipay.
Thanks for the offer but I don’t have a way to accept donations via Wechat or Alipay.
There are many 中国 clones (some highly attractive) of SumatraPDF which encourage mass eastern funding via the methods above.
Due to financial market controls it is difficult to port from Republican Renminbi values to Democratic Dollars without an approved State Official Broker taking a large cut.
PayPal International are trying to form a less expensive bridge so it may be worth approaching them