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 1. what are so little, tiny vertical QR code like columns sometimes we see in the end of the notes? is it zaps icon?  #nostr 

2. why do many accounts have url like .com endings after account @ symbol? 
 
 #asknostr
nostr:nevent1qqsrst6x2hl9ald285y0dpfa2j54cevxe6yzca6gxm9da5aek932d8gppemhxue69uhkummn9ekx7mp0qgs9el2kq5v5maegpezxnra6samyrgrtgny3khwf78pk6x8h64lt0qqrqsqqqqqpkhn892 
 I dont know about 1, have not see those QR codes.

About 2, is an NIP05 implementation, where you can link your NPUB to a website . If I had access to the back end of cocacola . com I could make my npub Cyberplanta@Cocacola.com 
 1. It sounds like you may be implying lightning invoices or the QR code for a lightning invoice

2. Nip-05 verification https://image.nostr.build/52331d0d6e90f3e73814dc766c0ce7a3e776c8c76b75ed48084e07067c11b815.jpg