leaky-paywall-hide-category-archive.php

<?php

add_action( 'template_redirect', 'zeen101_custom_redirects' );

function zeen101_custom_redirects() {

	if ( !is_category() ) {
		return;
	}

	$allowed_cat_ids = array( 4,9 );

	if ( !is_category( $allowed_cat_ids ) && !leaky_paywall_user_has_access() ) {
		wp_redirect( home_url( '/subscribe/' ) );
		die;
	}

}