s is the field name */ __( 'Order attribution field: %s', 'woocommerce' ), esc_html( $field_name ) ), 'type' => array( 'string', 'null' ), 'context' => array(), 'arg_options' => array( 'validate_callback' => $validate_callback, 'sanitize_callback' => $sanitize_callback, ), ); } return $schema; }; } }