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Categorically, the answer is 'Not Applicable' as per PCI DSS v.3.2.1 - Clause 4.2 - Never send unprotected PANs by end-user messaging technologies (for example, e-mail, instant messaging, SMS, chat, etc.).
As per PCI DSS, cardholder data (CHD) is not recommended to be exchanged over end-user communication channels such as chat, emails, and calls.
Further, in the case of chat and emails, customers can sanitize their conversations through our Data Redaction app. Agents can invoke our secure form through interaction in the chat and provide their card information. Likewise, our Caller system can be invoked within the Support system and can be used by agents to provide any card-based transaction support.
Having said that, in both standalone Freshchat and standalone Freshcaller, the data stores are encrypted in transit and at rest. We have also implemented multi-tiered security controls that are also audited as part of SOC 2, ISO 27001, ISO 27701 and Cyber Essentials Plus certifications.