Hi all,
I'm pleased to advise that the TROY card type has been added in the upcoming v8.13 release.

Version 8.13 is currently undergoing public pre-release testing. Please use this opportunity to test it out and share your feedback with us: https://whmcs.community/forum/652-whmcs-813-beta-discussion/

Feature Documentation: https://docs.whmcs.com/system/general-settings/general-settings-invoices/#accepted-credit-card-types

To learn more about the beta and to take part, visit https://beta.whmcs.com