Banks will often send us Credit confirmations (aka Payment traces or just Traces).
Banks will send these when they have sent funds to us but they have reason to believe that funds have not landed in the beneficiary account and the beneficiary claiming non-receipt. The reasoning can include but is not limited to; an issue with the remitted payment (keyed to wrong details on the sending banks end), payment held by compliance either due to velocity limit breaches or fraud concerns, payment being bounced back by compliance, etc.
As an example, we'll use this ticket https://modulrfinance.freshdesk.com/a/tickets/360944 from Starling.
As we can see, they have provided us with an FPID of a payment they made and asked us to confirm that funds have credited an open and active account in the name of the intended beneficiary Jack Lear.
In order to check this we can use the metabase query Faster Payment ID search, and paste the PFID they gave into the search criteria as below (be sure to remove any spaces before or after the FPID) and hit play (or Ctrl+Enter):
Here we can see that the payment is on a "Processed" status indicating it has credited the account, and the customer name is Jack Lear which is the same as the intended beneficiary that starling has given. Though not a normality, we can also see that the account is client blocked (block by partner, Pockit) and so thw customer will not have visibility of the account which is likely why they have raised a trace. However, as the payment is in a processed status, the payment credited the account when it was active and so we can advise Starling of that.
When responsing to the ticket, we have a canned response (/c) called Credit Confirmation Resonse. 
With this response we need to fill out the 4 feilds given, FPID, Date, Amount, and payment reference. We can simply copy all these from the metabas query and paste them into the canned response.
Once filled out, we can send off the email to the remitting bank.
Once the emial is sent, we will also need to close the ticket. We have a scenario automation for setting all the correct fields called Payops - Credit Confirmation New 
Once this is done the ticket will close and you can move onto the next!