'woocommerce_webhook_topics', array(
                                    ''                 => __( 'Select an option…', 'woocommerce' ),
                                    'coupon.created'   => __( 'Coupon created', 'woocommerce' ),
                                    'coupon.updated'   => __( 'Coupon updated', 'woocommerce' ),
                                    'coupon.deleted'   => __( 'Coupon deleted', 'woocommerce' ),