pmpro_orders_csv_export_filename

Filter to adjust the default filename for the orders export from the Membership > Orders > Export to CSV page in the WordPress admin.

pmpro_orders_csv_extra_columns

Filter hook to add extra columns to the Orders CSV export. Passes an array of column data with the format $extra_columns['heading'] => callback_function.

pmpro_tax

Modifies the tax associated with an order. Passes the tax amount, an array of values such as the price of the order and more, and the MemberOrder object.