When you go to a different eBay site you will always have to log in to that site to do anything other than browse. Although you can use the same account and password the log-in has to be done on each site.
As to the EIS payment issue your buyer is having, I don't use it (I ship direct). One thing I do not know is if the billing process works the same way as it does for a normal domestic sale or an international sale NOT using EIS. In those cases the "billing" is immediate, maybe there is a lag when it is an EIS sale.
Maybe there is a Canadian user who has bought from the US via EIS here on the board (there are quite a few regular poster here that are registered in Canada) that has experience with the process and knows what issues there can be.
One possible issue is the size of a golf club, there are restrictions on what can be shipped via EIS
eBay pretty much adds EIS as an option based on the Category it is listed in, that is too general as there are Categories that would qualify but those Categories can contain items which exceed the weight or length that EIS has, I'm not sure what happens in those cases, they should block them from EIS but I don't know how they deal with that.
I don't golf and don't really know what the packed size would be but I expect it's possible it would exceed the limit (a golf club must be very close). It looks like you had flat rate shipping on that listing, since you don't have to include weight/dimensions when you use flat-rate it might be that which is the problem, did you add this info to the listing?
Or maybe it's something completely different that is causing the payment issue for your buyer, I'm really just speculating.
One thing for sure, having logged in to .ca would not be the cause of the problem, that is simply coincidence.
