I have installed WHMCS WP Integration plugin and i test it

I have installed WHMCS WP Integration plugin and i test it and looks very well.

But, i have a problem:
I only can use it if i remove https from WHMCS.
If I use https with WHMCS when click some link, like "open ticket" i was redirected to the WHMCS installation (with https).

I really want to use https with WHMCS