Dev Docs Example: WooCommerce Memberships product notice for non-members

wc-memberships-member-product-notice.php

<?php
// Display a top notice to non-members for members-only products
function sv_members_only_product_notice() {

    if ( ! function_exists( 'wc_memberships' ) ) {
        return;
    }

    $user_id = get_current_user_id();

    // Bail if the user is already a silver or gold member
    if ( wc_memberships_is_user_active_member( $user_id, 'silver' ) || wc_memberships_is_user_active_member( $user_id, 'gold' ) ) {
        return;
    }
	
    // Add our top notice if purchasing is restricted
    if ( wc_memberships_is_product_purchasing_restricted() ) {
        wc_print_notice( 'This is a preview! Only silver or gold members can purchase this product.', 'notice' );
    } 
}
add_action( 'woocommerce_before_single_product', 'sv_members_only_product_notice' );