But if I add the query string, say ?___store=default at the end of the content in the <url> tag, the html output looks like this http://mydomain.tld/checkout?___store=default/. Notice the added slash in the end prevents it from working.
I then experimented with the <urlParams> tag, which also lacks total documentation and no forum posts describing the usage of it. So, I tried to add it like this:
I’ve worked this out so far with the addLink action. Hope it helps.
With your current setup, try turning <prepare>true</prepare> to just <prepare/>, and try the URL as <url>/checkout?___store=default</url>, or what ever the extension.
Thanks for the info. Very much appreciated. I did, somehow, get around it in the project that had issue (but can’t exactly remember what I did). Anyway, this is definitely useful information you have provided. Thank you.