Load all possible TLDs into WHMCS supported by eNom.
If you have WHMCS installed and you do not want to go through the painful process of typing all the TLDs one by one and set their pricing by hand, there is a solution.
Simply install the eNom TLD Importer module by uploading it to
/modules/addons/ and then go to Setup > Addons to activate it and run it. The addon will then automatically load all TLDs from your eNom account into WHMCS with their pricing and settings as configured.