This issue has now been resolved, and Criteo tracking has been re-enabled on the affected sites that want to use it moving forwards.
Dec 7, 13:08 GMT
Our integration with Criteo has been temporarily disabled for all affected clients. We will continue to monitor the situation and will re-enable the integration once we are confident that it will not prevent customers from proceeding through the checkout.
Dec 7, 11:48 GMT
We are currently investigating ways to mitigate a bug in Criteo's tracking code which is affecting the ability to proceed through the checkout process for clients who use their services.
Dec 7, 11:39 GMT