Refer to How to create a pay run? to create a draft pay run that can be edited.
Step 1: Click on "Pay Runs" and select the relevant unpublished pay run which you want to edit
Step 2: Click on the drop-down button next to the employee's "Net Pay"
Step 3: Enter the "Hours" as 1 and "Base Rate" as the fixed value you wish to pay
Step 4: Click on "Save" to save the updated values
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