Click on Sales
Click on Payments
Click on the Payment
You can see the person who made the purchase.
Clicking on the person will take you to their contact record with their entire history.
If there are any related companies, they will be listed here.
Click on See the businesses or organizations associated with this record. This only populates is the contact is already associated with a company. You can manually associate the payment to a company after the payment is made by clicking "Add".
Processing Fees
This shows the related Deal with the payment.
These are generated to create advanced reports.