Official X-Cart comments on PayPal service upgrades (switch to SHA-256 scheduled for 9/30/2015)
Being a reliable and trusted provider of such a sensitive service, PayPal do their best to guarantee the top-notch security to their users. But sometimes the security upgrades require actions from the users too - at least, making sure nothing is broken after another update. This is exactly what is happening now, so you might have already received an email titled "IMMEDIATE ATTENTION REQUIRED: PayPal service upgrades" . What does it mean and what should you do?