Cayan's SHA-1 Deprecation Policy

Many merchants have recently received notices from their acquirers regarding their discontinuing support of a legacy encryption protocol, known as SHA-1. You may have been advised to upgrade your web browsers or to contact your payment services provider to ensure that you do not lose the ability to accept card-based payments due to this change.
In August 2015, the US National Institute of Standards and Technology published a finding that all federal agencies must stop using the SHA-1 encryption algorithm in favor of the more secure SHA-2 or SHA-3 encryption algorithms, as the SHA-1 algorithm is no longer considered to be secure against attacks by well-funded hackers. Major web browsers, such as Microsoft, Firefox and Chrome will stop supporting SHA-1 in 2017.

The PCI Security Standards Council requires that its members, such as Cayan and its merchants, use strong cryptographic protocols to secure cardholders’ payment data. In response, most payment processors have begun upgrading their payment solutions to support newer and more secure cryptographic protocols, and are working with their merchants and partners to ensure their timely complaince and to ensure that there's no loss of service.
Fortunately, this change will not affect Cayan’s merchants. Cayan’s web sites and payment gateway have only supported the stronger SHA-2 and SHA-3 cryptographic standards, and proactively disallowed the use of SHA-1 shortly after the NIST's publication some 13 months ago. If you are using Cayan’s services today, there is nothing you need to do in response to this message. Cayan's readiness can be verified by using tools such as the Qualys SSL Labs Server Test.
Cayan has additionally verified that its transactions with its payment & stored value partners - such a First Data, Elavon, WorldPay, Chase Paymentech, Global Payments, TSYS, and Vantiv - use the strongest possible encryption standards available, so that there will be no disruption in our merchants’ ability to accept card-based payments, while ensuring the security of our merchants' transactions.