1. You have NOT received the shop yet. It is only in your shopping cart. If you haven't committed to an assigned date yet, you don't have the shop. You have made no obligation whatsoever to the shop. (Thank goodness, because that's too cheap!) It's only in your "shopping cart".
2. Yes, they use "commission" instead of "fee".
3. You will incur NO penalty for letting the shop expire out of your shopping cart... I do it all the time when I'm considering a route, and nothing has ever come of it. The only time there would likely be a penalty is if you actually accept the shop (by choosing a date, checking the box next to "I have read... blah blah blah" & clicking "checkout"
and THEN don't perform the shop without contacting them.
4. As mentioned, $5 is too cheap for this shop. Although, with an $8 reimbursement, if you really *need* something in the $13 range from this store, well, there you go. I admit I did that once when I really needed a housewares item and wanted it reimbursed. But, these shops go up in pay fairly quickly, at least in my area. I like them around the $15 + $8. Or higher, of course.
This is the housewares place, right? That's usually their base commission/reimbursement.
Oh, and...
5. Since this shop is just at it's base rate, you probably have selected from the list of November shops, rather than end of October. Also, check the "Start by"/"Due by" dates on the shop information. The closer to the "due by" date, the better pay it will get.
Practitioner of the Nerdly Arts.