I received a second email from Bestmark, giving me a DIFFERENT url from the one they said was right. I clicked on that and it was a non-working URL! I emailed them again. I did not hear back.
I just checked my payment history and it is still only showing one shop done, but the pay shows as $8 instead of $4.
So it looks like I did go to the correct site.
I'd like to know why they don't tell you the URL when they give you the shop.