All I can say is, if you get a choice between checking out with Shop(ify) or PayPal, use PayPal (or indeed anything else).Shopify do not guarantee transactions in any way, have no interest in assisting you in dealing with unfulfilled orders, and clearly make no effort to withdraw their services from inactive or even fraudulent sellers. Beware.
Claim your business profile now and gain access to all features and respond to customer reviews.