apply_filters( 'learndash_purchase_invoice_query_string_params_allowed', array $query_string_params_allowed, array $query_string_params_supported )
Filter for allowed PDF purchase_invoice parameters.
apply_filters( 'learndash_purchase_invoice_query_string_params_allowed', array $query_string_params_allowed, array $query_string_params_supported )
Filter for allowed PDF purchase_invoice parameters.