Payment Certificate's (PPC) is automatically generated and issued to the claimant when you approve a claim.
In terms of configuration, it is a system generated workflow how ever as an administrator you have the option to configure it’s labels
To do this go to Configure → Form Types → PPC (Payment Schedule) form → Contract Admin tab
Click “Payment Certificate Settings”
You will see 13 to 14 rows here. For each row, you can edit the Label that user sees (as shown below)