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<?php

// hide coupon form from the cart and checkout pages if there's a deposit product in the cart
function hide_coupon_field( $enabled ) {
	if ( is_cart() || is_checkout() ) {
		if ( class_exists( 'WC_Deposits_Cart_Manager' ) ) {
			if ( WC_Deposits_Cart_Manager::has_deposit() ) {
			  $enabled = false;
			}
		}
	}
	
	return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'hide_coupon_field' );