My credit card works normally elsewhere. Why does the online authorisation fail when I order?

Online credit card authorisation requires communication between the acquiring bank and your card-issuing bank. If the online authorisation cannot be completed for any reason,
the acquiring bank will relay the message provided by your card-issuing bank back to the website page;
as this information involves customers' personal and private data, we suggest you first call your card-issuing bank to find out the reason, or place your order using another payment method.