Limit page visibility only if customer has bought specific product

functions.php

/**
 * Kontrollon aksesin per pruktet
 */
function sajdoko_to_login_if_not_customer() {
  global $post;

  $user_id = get_current_user_id();
  $current_user = wp_get_current_user();
  $customer_email = $current_user->email;

  $paketat_page_prod = [1439 => 1211, 1431 => 1210, 1441 => 1214, 1440 => 1212]; //page => product

  // nese faqja eshte nje nga faqet e videove
  if (array_key_exists($post->ID, $paketat_page_prod)) {
    // nese eshte i loguar, ne te kundert redirect tek login
    if (is_user_logged_in()) {
      // nese nuk e ka blere produktin, redirect te bleje produktin
      if (!wc_customer_bought_product_paid($customer_email, $user_id, $paketat_page_prod[$post->ID])) {
        wp_redirect(esc_url(get_permalink($paketat_page_prod[$post->ID])));
      }
    } else {
      // redirekt tek login
      wp_redirect(esc_url(wp_login_url()), 307);
    }
  }
}
add_action('wp', 'sajdoko_to_login_if_not_customer');

function sajdoko_shfaq_link_page_to_dashboard() {

  $user_id = get_current_user_id();
  $current_user = wp_get_current_user();
  $customer_email = $current_user->email;
  $paketat_prod_page = [1211 => 1439, 1210 => 1431, 1214 => 1441, 1212 => 1440]; //product => page
	$produktet_e_blera = sajdoko_merr_produktet_e_blera();

	if (is_array($produktet_e_blera) && !empty($produktet_e_blera)) {
		echo '<h3>Paketat aktive:</h3>';
		echo '<ul>';
		foreach ($produktet_e_blera as $key => $value) {
			if (wc_customer_bought_product_paid($customer_email, $user_id, $value)) {
				$link = esc_url(get_permalink($paketat_prod_page[$value]));
				if ($link) {
					echo "<li><a href=\"$link\">".get_the_title( $paketat_prod_page[$value] )."</a></li>";
				}
			}
		}
		echo '</ul>';
	}

}
add_action('woocommerce_account_dashboard', 'sajdoko_shfaq_link_page_to_dashboard', 10);

/**
 * Kontrollon nese produkti eshte blere dhe paguar
 */
function wc_customer_bought_product_paid($customer_email, $user_id, $product_id) {
  global $wpdb;

  $result = apply_filters('woocommerce_pre_customer_bought_product', null, $customer_email, $user_id, $product_id);

  if (null !== $result) {
    return $result;
  }

  $transient_name = 'wc_cbp_' . md5($customer_email . $user_id . WC_Cache_Helper::get_transient_version('orders'));

  if (false === ($result = get_transient($transient_name))) {
    $customer_data = array($user_id);

    if ($user_id) {
      $user = get_user_by('id', $user_id);

      if (isset($user->user_email)) {
        $customer_data[] = $user->user_email;
      }
    }

    if (is_email($customer_email)) {
      $customer_data[] = $customer_email;
    }

    $customer_data = array_map('esc_sql', array_filter(array_unique($customer_data)));
    $statuses = array_map('esc_sql', wc_get_is_paid_statuses());

    if (sizeof($customer_data) == 0) {
      return false;
    }

    $result = $wpdb->get_col("
				SELECT im.meta_value FROM {$wpdb->posts} AS p
				INNER JOIN {$wpdb->postmeta} AS pm ON p.ID = pm.post_id
				INNER JOIN {$wpdb->prefix}woocommerce_order_items AS i ON p.ID = i.order_id
				INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta AS im ON i.order_item_id = im.order_item_id
				WHERE p.post_status IN ( 'wc-" . implode("','wc-", $statuses) . "' )
				AND pm.meta_key IN ( '_billing_email', '_customer_user' )
				AND im.meta_key IN ( '_product_id', '_variation_id' )
				AND im.meta_value != 0
				AND pm.meta_value IN ( '" . implode("','", $customer_data) . "' )
		 ");
    $result = array_map('absint', $result);

    set_transient($transient_name, $result, DAY_IN_SECONDS * 30);
  }
  return in_array(absint($product_id), $result);
}

function sajdoko_merr_produktet_e_blera() {

  // Get the current user Object
  $current_user = wp_get_current_user();

  // Check if the user is valid
  if (0 == $current_user->ID) {
    return;
  }

  //Create $args array
  $args = array(
    'numberposts' => -1,
    'meta_key' => '_customer_user',
    'meta_value' => $current_user->ID,
    'post_type' => wc_get_order_types(),
    'post_status' => array_keys( wc_get_is_paid_statuses() ),
	);

  // Pass the $args to get_posts() function
  $customer_orders = get_posts($args);

  // loop through the orders and return the IDs
  if (!$customer_orders) {
    return;
  }

  $product_ids = array();
  foreach ($customer_orders as $customer_order) {
    $order = wc_get_order($customer_order->ID);
    $items = $order->get_items();
    foreach ($items as $item) {
      $product_id = $item->get_product_id();
      $product_ids[] = $product_id;
    }
  }

  return $product_ids;

}