Hello!
I'm WHMCS admin user/developer already since v2.2 (somewhere in year 2006), did many template customization, hacks & hooks, provisioning modules and payment gateways (last was The Ethereum payment gateway & VPN account provisioning module for WHMCS 7.9).
I would love to integrate discord with whmcs for you,
its a piece of cake for me :)
Looking forward working with you,
Junell