For extra fraud protection, 3D Secure (3DS) requires customers to complete an additional verification step with the card issuer when paying. Typically, we direct the customer to an authentication page on their bank’s website, and they enter a password associated with the card or a code sent to their phone. This process is familiar to customers through the card networks’ brand names, such as Visa Secure and Mastercard Identity Check. You can check your bank for more information. The Strong Customer Authentication regulation in Europe requires the use of 3DS for card payments. 3DS may be optional in other regions but we are using it to reduce fraud if your bank supports it.