Unfortunately, Pleo is currently incompatible with Mastercard® 3-D Secure, which implies that merchants requiring a 3-D Secure verification will not be able to be paid using your Pleo cards.
3-D Secure is an XML-based protocol designed to be an additional security layer for online credit and debit card transactions that certain merchants adopt to protect their consumers.
It is however, a feature we are working on and hope to implement soon! We are excited to make Pleo even more flexible and secure for our users and we will be in touch as soon as it is ready to go.
Should you have any questions or suggestions feel free to contact us at firstname.lastname@example.org