You can add up to 5 Visa and/or MasterCard cards with 3D Secure support.

What is 3D secure?
For your protection against credit card fraud, the Strong Customer Authentication regulation in Europe (in force since 14 September, 2019) requires the use of 3D Secure for card payments online.

During payment process, the 3D Secure requires the customer to complete an additional step of verification with the card issuer company before allowing the transaction. This would typically redirect the customer to the bank's website, where one will be required to authenticate using the bank's/card issuer company's standard methods.
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