Renames application_fee on invoices to application_fee_amountBreaking changes

What’s new

Renames both the application_fee parameter on Invoice API methods and the application_fee field on the Invoice object to application_fee_amount.

Impact

This change renames the application_fee parameter and field to application_fee_amount in the invoice API methods and Invoice object. You need to update your code to use the new application_fee_amount name when setting or retrieving application fee information for invoices. This modification provides more clarity about the nature of the value (an amount rather than a fee object), but requires updates to existing code that handles application fees.

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