I bought the domain and did some ads and everything ok.But after 2-3 days my url stopped working.It says your url is not valid.Anyone know the problem?
You can start by checking the connection from your domain with Shopify. Navigate to Online Store > Domains and check the connection, If there is an error it should pop up there. Hope this helps!
Did you rewrite the landing page?
For example. The original is www.xxx.com/1234 you rewrite it into like www.xxx.com/12345