If you input a security code, then you don't have to show your credit card during boarding!
A security code is needed to authenticate credit card payments made on the Solaseed Air website.
This improves the safety of using a credit card and eliminates the need to bring along your credit card during the boarding procedure.
Security codes are three-digit or four-digit numbers printed separately from the credit card number, and not printed on the credit card usage statement. Because the security code is known only to the person in possession of the card, it provides greater security when making purchases online.
The last three digits printed on the credit card's signature box is the security code.
Some credit card companies might print a four-digit security code on the front of the card.