Looks like you have Github hooks setup for test but I'm not sure if they automate adding / removing cookies from domains. Not sure how that could be tested without some sort of headless browser. I tested functionality locally with ngrok and all seems to checkout but domains and cookies can be tricky per this post https://stackoverflow.com/questions/18492576/share-cookies-between-subdomain-and-domain
Adding cookie domain option per discussion #25
Looks like you have Github hooks setup for test but I'm not sure if they automate adding / removing cookies from domains. Not sure how that could be tested without some sort of headless browser. I tested functionality locally with ngrok and all seems to checkout but domains and cookies can be tricky per this post https://stackoverflow.com/questions/18492576/share-cookies-between-subdomain-and-domain