Because of the way that PayPal standard works, you cannot run power store transactions through the PayPal testing testing server to see what the purchase record will look like.
The issue is this:
Processing the order through the paypal testing server will only test whether the pass off of to the testing server and then redirect to the success page works.
the paypal standard testing server does not do the IPN post that is used to store the cart information into the power store database.
using paypal standard it is not possible to test transactions in power store.
If you want to see what a purchase record looks like, then set the gateway to none.
This will go through the actions of purchasing and store the order info in the database without passing out to a gateway.