pmpro_orders_csv_extra_columns

Use this hook to add extra columns to the Orders CSV export. Passes an array of column data with the format array("heading", callback).

apply_filters( "pmpro_orders_csv_extra_columns", array() );

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.

apply_filters("pmpro_tax", int $tax, array $values, MemberOrder $this);