You did answer two of my initial questions with your first reply - as far as what was unclear to me from the PDF. One was whether I click the lightning bolt after entering the store ID number, and the other was whether my "linkpoint" folder was in the correct place (I used the suggested path and replaced the pem name with mine, and my linkpoint folder is at linkpoint.)
I asked these questions because at that time, I had gone through the steps twice (and have gone through it three more times since then), and have yet to have an area show up where I can enter the credit card information. Only the areas for billing and shipping information are there. If I fill it out and click checkout, then yes, I get the checkout_failure.php page.
So to back up, I added a product to the cart, then clicked "Checkout", and was taken to checkout.php (shot1.jpg) The first time I saw this page, I assumed the credit card info would be entered on the next page, so I clicked Checkout. Shot2.jpg is the result of doing that.
I'm wondering, though... the PDF has me editing confirm.php, but is there nothing to be done to checkout.php?
I'm going to stay up a few hours more (it's 1:17 in the morning here) in hopes that you will reply back soon... I really want to go with my son on his senior trip next week with this store up and running! ;)