eBay

Hello! So I've come across some Japanese sellers,on eBay and on Amazon.But on eBay they ask for paypal. Is it ok to buy from these sellers

Back in 2016 I came across a seller who is presumably based in South Korea.Now in 2017 I came across a seller who is based in the United Kingdom. They look legit,but they are somewhat suspiscious. What do I do? Are UK and South Korean sellers legit o...