There are quite a few questions about http vs. https. I think the most similar to mine is Is HTTPS redirecting to HTTP a vulnerability?
My question is: I visited a website where the login page was secure (https) but the rest of the site was not secure (http). When directed to the payment portal, I initially ended up on a not secure page (http). Can I just add prepend https to the url or could that make it forget what I was paying for and/or would there be some negative side-effects from going there from the http version of the website. www.imleagues.com is the website in particular. Interestingly, www.imleagues.com/Members/Payment/Paypal.aspx now redirects to https (OSX 10.12.6, chrome) but it still goes to http when redirected to that page after clicking "Buy Spring Pass" (which is quite a few pages away from the homepage; that behavior occurs on OSX 10.12.6 firefox and chrome as well as on RHEL7 firefox).
If you think it's okay then I'll post it on non-meta. If you think it is a duplicate, I'm interested in your explanation. I think it's rather similar but different enough for me to ask. But, I thought I'd check here first in case my intuition is off.