A pending offline payment, is a payment that is awaiting confirmation that it has been paid to your business.
Any pending offline payments you have can be found under Billing/Revenue>Pending:
From here you can confirm that you have received a pending payment, and amend the price you are confirming.
You can also change the confirmation date. This might be particularly useful if you have confirmed a payment via one of your offline payment methods on different date, and want your internal records and teamup to match.
You can also edit the payment total without confirming, and cancel any payment that is no longer required:
Tip. You may have multiple pending offline payments that you want to confirm in bulk.
Just use the bulk confirmation tool for this.
You can confirm all payments if you choose, or select the payments you wish to confirm from the list available: