Regarding Qerko lightning payments in Czechia, you have to enable it first because it's in testing mode.

Here is a tutorial:

https://qerko.freshdesk.com/support/solutions/articles/80001077943-how-to-pay-with-bitcoin nostr:note1zpqugs8vc3658zvp8qfhl2e70z6vt8ycewj4jdjf4h3wks5td75qkvzqjr