It shows I received a payment but I have no idea where it went

it shows I received a payment but I have no idea where it went. 

You can review your form submission data in the View Submission panel.

User guide: How-to-View-Form-Submissions

For the payment submissions, successful payment submission will be credited to the payment account you used in payment integration.

For example on your form, since you used Square payment integration, the payment should be credited to your Square account.

Do take note that if you have only set your form into Test Mode, there will be no real payment transaction that will occur.

Set it to Live mode if you want the payment to reflect on your account.