1) Obtain Order Number (circled in red) and Invoice Amount (circled in green) from Campbells' invoice
2) Go to PayPal.com
Click "Send & Request" near the top
Enter "firstname.lastname@example.org" then click "Next"
Enter the Order # (circled green below) in the "Notes" section
Enter the Order Number in the "Notes" (circled red) then complete the PayPal transaction.