: Share Secure Url Between Multiple Sites I have a customer who has a bunch of websites, such as islandwidgets.com, mainewidgets.com, etc..., but he would like to have them all use secure.widgets.com

@Berumen354

The first thing to bare in mind is that a wildcard SSL certificate is only marginally more expensive than a standard certificate, and a wildcard certificate would resolve the issues cleanly.

If a single secure domain is required (assuming secure.example.com) then what you would need to do is ensure that shopping cart data is stored in the database and when the user goes to the checkout (secure site) some unique one time key is passed along with it to identify the cart in question and recall the products being sold to be processed through the checkout.

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