How to simulate multiple accounts with your PayPal account

The trick is to add additional email addresses to your PayPal account.  

Once you have added additional email addresses to your PayPal account you can then point your Pay It Square account to any of those emails via your Profile page.

Each payment sent to your PayPal account will indicate the email address that received it.  You can then use the "Payment Received to:" filter in the Transaction History to see just the payments you received from your Collect Page.  Here is an example of where to find the filter: