When the Setup > Account > Account Class Manual Convenience Fee Type configuration on the Payment Processing tab is set to None, the Apply Convenience Fee checkbox is hidden on the Post a Payment screen.

Pathway: Account > AR History > Post Payment
When the Setup > Account > Account Class Manual Convenience Fee Type configuration on the Payment Processing tab is set to None, the Apply Convenience Fee checkbox is hidden on the Post a Payment screen.

Pathway: Account > AR History > Post Payment