callback url HTTP not HTTPS

Hi Tuan,
A subscriber to my website just sent me an email with the following info:

the callBack url from PayPal to [site] is http while it should be https (it would avoid having paypal saying that "the form is being transmitted unsecure" after the purchase.

Is this a setting I have control over?

Thanks

Hi

What's strange. Maybe you could submit a support ticket giving us admin and FTP account of your site so that I can check to see what's causing this issue and get it corrected ?

Regards,

Tuan