Create WooCommerce Coupon Automagically

gistfile1.php

add_filter( 'woocommerce_coupon_code', 'create_coupon' );

function create_coupon ( $coupon ) {

	if ( '' != $coupon ) {

		//$the_coupon = new WC_Coupon( $coupon );

		if ( ! $the_coupon->id ) {
			$coupon_data = array(
				'post_title'   => $coupon,
				'post_content' => '',
				'post_status'  => 'publish',
				'post_author'  => 1,
				'post_type'    => 'shop_coupon'
			);

			$coupon_id = wp_insert_post( $coupon_data );
			update_post_meta( $coupon_id, 'discount_type', 'percent_product' );
			update_post_meta( $coupon_id, 'coupon_amount', '50' );
		}

	}

	return $coupon;

}