If your PIN is locked, contactless will only work for a certain number of transactions. To get it working again, you'll need to unlock your PIN and then make a payment using your card with the PIN.
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You might not have your PIN number, but you can still use your credit card without it. Most point-of-sale machines offer contactless pay options where you can wave your card next to the reader. Contactless pay options allow you to complete your transaction without inserting your card into the machine.