Removes the payment instructions from the COD payment gateway in WooCommerce.

functions.php

<?php // do not copy this line

/**
 * Removes the payment instructions from the COD payment gateway in WooCommerce.
 */
function jp_custom_remove_instructions(){
	if ( ! class_exists( 'WC_Payment_Gateways' ) ) {
		return;
	}

	$gateways           = WC_Payment_Gateways::instance(); // gateway instance
	$available_gateways = $gateways->get_available_payment_gateways();

	if ( isset( $available_gateways['cod'] ) ) {
		remove_action( 'woocommerce_email_before_order_table', array( $available_gateways['cod'], 'email_instructions' ), 10, 3 );
	}
}
add_action( 'woocommerce_email_before_order_table', 'jp_custom_remove_instructions', 1 );