The shop fee is the fee a shopper will get for performing the shop. Reimbursement is the amount refunded for a required purchase. Although it is not the case for all shops, many shops that have a required purchase will have both a shop fee and a reimbursement. Some of the later are up to a maximum amount. There are a few shops that have no shop fee, just a reimbursement.
No, you will not pay the shop fee, just any required purchase.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut