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By following the instructions below, you’ll be able to change the mapped client of an existing contact to any client already in the system.

1: On the Optimo site, Go to Finance>Sales Ledger. 
2: Search by the booking reference. 
3: Untick the 'Only allocated' checkbox & click on the Filter button. 
4: Select the payment you want to refund. 
5: Click Refund 
 
6: Select the Payment type, enter the required details on the Refund pop-up and Save. 
 
Step 7: Once refunded, select the payment and Click Match. (Recommended to select one payment at a time to match)