If you already have this CCB credit card, it is recommended that you log in to the CCB credit card official website to apply for another dual-currency credit card online (with visa or master), and select "already have a CCB credit card". Register your original credit card number. With this method of applying for a credit card, the card will be issued quickly.
The IC cards of China Construction Bank are all China UnionPay single-label cards. The scope of application when going to Brazil will be limited. If you can have both visa or master, it will be safer!
For credit card consumption, as long as you repay the bill in full and in time after returning to China, you will enjoy interest-free (cash withdrawals are not interest-free). In addition, if you spend abroad, if it is a non-US dollar transaction, Moreover, if the card is swiped by Visa/Master, the transaction will incur a 1.5% exchange fee. If the other party's POS machine supports China UnionPay, it will eventually be converted into RMB and entered into the account, and there will be no exchange fee.