Change membership badge in WooCommerce Memberships

change_membership_badge.php

<?php

/**
 * Change member discount badge.
 */
function change_membership_badge( $badge, $the_post, $product ) {
	if ( $product->is_type( 'variable' ) ) {
		$variations = $product->get_available_variations();
		foreach ( $variations as $variation ) {
			$regular_price = $variation['display_regular_price'];
			$sale_price = $variation['display_price'];
		}
	} else {
		$regular_price = $product->get_regular_price();
		if ( !$regular_price ) $regular_price = $product->get_price();
		$sale_price = $product->get_sale_price();	
	}

	// Change default badge text to discount percentage
	$percent_dicount = round( (($regular_price - $sale_price) / $regular_price) * 100 );
	$custom_badge = '<span class="onsale wc-memberships-member-discount">' . $percent_dicount . '%</span>';
	
    	return $custom_badge;
}
add_filter( 'wc_memberships_member_discount_badge', 'change_membership_badge', 10, 3 );