You will be able to lookup your receipt here, https://www.theparkingspot.com/receipts.
Or if you have a Spot Club account, you are given the option to reprint your receipts on the main page after you login to your Spot Club account, under the Transactions history on the left and side. The click View Receipt next to the stay.
If you do not have a Spot Club account or your receipt is not shown on your Spot Club account, you can lookup your receipt here, https://www.theparkingspot.com/receipts.