PHP 7.2 & 7.3
Ioncube Loaders v 10.x
WHMCS 7.7.1 supports 4.4.0, 4.4.1
WHMCS 7.8.x 7.9.x & 7.10 supports 4.4.1 & 4.5.0
While these are the minimum requirements, we
strongly recommend using the latest available, stable releases of all software and extensions