How to 'Edit payment processing fee default'.
1. Select 'Settings' from the left-hand navigation panel.
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2. Under 'Billing' click 'Edit payment processing fee default'.
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3. Enter a value for 'Charge of convenience fee of __% for payment processing'.
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4. Click 'Save Settings'.
NOTE: You must enable this feature on the matter(s) you would like to attach payment processing fees to.