How to cahnge HTTP to HTTPS the fastest way to all you existing listings in ebay?
Ebay only allows you to make changes in bulk up to 200 or 500 lisitngs at a time (depends on the kind of your ebay account). So if you have a lot of lisitngs you'll need to repeat the procedure a few times accordingly.
Please go your Seller Hub in ebay > Listings, scroll down the page to RESULTS and pick out the first 500 lisitngs to edit:
In the next screen - select all:
Now fill the fields with information as in the screenshots below:
And finally - submit and you are done!