well, I've struggled to install this blessed thing for several hours - all I get is a "runaround" - the cart goes from step 3, back to step one, ad infinitum............
I thought Paypal integration was appallingly complex - this has it beat, hands down
Amongst other problems, how the heck do you sign up for a sandbox account? - if you prod the appropriate buttons on the Google site, you end up signing up for another merchant account............the site seems to be full of revolving doors, sign in for this, sign in for that, and end up in a state of total desperation..........
I am on the point of giving up.........the link to the Google site "help thread" is of no use whatsoever........primal scream therapy beckons!