i did a my unofficial investigation
seems like is a mirror site for china usage
suspect reason is their "great firewall of china"

example if someone got https://my.xiapibuy.com/product/689496204/16182167290/ from the seller
noticed that the API used is calling shopee.cn domain



compare with shopee MY constructed URL.. then i try replace the values from xiapibuy.com
from https://my.xiapibuy.com/product/689496204/16182167290/
to this https://shopee.com.my/cantypeanythingherela...204.16182167290

same product.. so we dont need to login/register at all from xiapibuy.com actually..

most probably the seller in China are using xiapibuy.com and not shopee.com.my

sekian~