ID, 'member_number', true ); if ( empty( $member_id ) ) { // lets generate it on the fly. $member_id = generate_member_number( $pmpro_membership_card_user->ID ); } $content[] = 'Membership Number: ' . esc_html( $member_id ); return $content; } add_filter( 'pmpro_membership_card_right', 'my_show_member_number_on_card', 10, 3 );