What I meant is when get invoice in the email, to use the pay invoice button on the invoice. That will mark the invoice as paid on my side so I can track what is paid for and what isn't easily.
Some people seem to for some reason get the invoice, then instead go into paypal and go through the send money option. While I will receive the payment, it doesn't mark the invoice as paid. This is especially more troublesome for me when it is done through some other paypal account as I have no idea what it was to be for. If you don't have money in paypal, you can still pay the invoice with other methods like debit/credit card or an echeck.