Updated time: Aug 6, 2020 , 12:45 (UTC+03:00)
PayCEC provides WHMCS payment gateway module, includes plugin and configuration information.
Download link: whmcs_paycec_2.0.zip Checksum SHA1: 1AFE54A9EDDC9393AE57C368909C793790AF308B
The integrating requirement followed by:
Steps to integrate:
Also read: Payment Gateway Integration Developer (Detailed version)