Start by going to Client Profile>Rates>Edit Client Payer
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 Then, scroll down to the authorizations that are entered and select the Edit Record icon
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After you make the change in the authorization window and save the authorization, make sure you also update the payer

Last step:whenever you change anything within a payer, make sure you use the Sync Payer button to assign the newest configuration to all schedules that have not yet been billed: