WooCommerce - rename the "Apply Coupon" field on the cart page

wc-rename-cart-coupon-field.php

<?php

// rename the coupon field on the cart page
function woocommerce_rename_coupon_field_on_cart( $translated_text, $text, $text_domain ) {

	// bail if not modifying frontend woocommerce text
	if ( is_admin() || 'woocommerce' !== $text_domain ) {
		return $translated_text;
	}

	if ( 'Apply Coupon' === $text ) {
		$translated_text = 'Apply Promo Code';
	}

	return $translated_text;
}
add_filter( 'gettext', 'woocommerce_rename_coupon_field_on_cart', 10, 3 );

dont work.

it works. check case of the 'apply coupon'. It might be Apply coupon!

Thanks @zakirsajib, I looked and mine WAS 'Apply coupon'. I changed the case and it worked on the button text!! TY!

Not working. Checked case as well.

In our case it was changing the capital 'C' to lowercase. Thanks for posting!

if ( 'Apply coupon' === $text ) {
    $translated_text = 'Apply Membership Discount';
}