How to enable SafeKey for American Express transactions online?

I have received this email from AmEx:

"We have noticed that some of your online American Express transactions will be declined due to regulatory requirements.

You need to urgently speak to your Payment Service Provider (PSP) or Payment Gateway to ensure that SafeKey is enabled on your checkout so that you can still accept American Express payments online."

I cannot find any reference to “Safekey” in Shopify Help or this Community. Has anybody else received this email, and have any advice on what to do?

I’ve had this email aswell and came looking for answers. @Shopify_77 any ideas?

I spoke to someone in Shopify support and they assured me that we can ignore the email, as they are set up properly for 3D Secure, which is what AmEx Safekey is.

Oh good, thank you @Mike_Berry