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?