[MODULE] WHMCS

[TGates]

That is probably because you are trying to use https on the IP:

Code:

Caught exception: Server error response [url] https://52.37.245.73/api/domains [status code] 500 [reason phrase] Internal Server Error

 instead of IP you should be using your panel's login URL (ex: http(s)://panel.domain.com). I'm not sure if this is specific to the WHMCS module or your personal setup (</xmws>' 'http://YOUR.SENTORA.IP.HERE/api/domains')
, but you should always only use your panel login url for anything related to the panel (api connections, login, etc.) as explained in our docs.