Magento 2 - Product category id on success

Question

How can I get the category id of the products ordered on the success.phtml page. I have managed to get other bits of data but cant find the category id.

I need to check the category so i can post to a third parties API only if a product from a specific category has been purchased.

My OOP knowledge isn't the best. So please be patient lol

Answer 1

<?php
$orderId = $this->getOrderId();
echo  "Order ID:".$orderId."<br/>";

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$order = $objectManager->create('Magento\Sales\Model\Order')->loadByIncrementId($orderId);

$items = $order->getAllVisibleItems();

foreach($items as $i):
    $_product = $objectManager->create('Magento\Catalog\Model\Product')->load($i->getProductId());
    $categoryIds = $_product->getCategoryIds();
endforeach;

?>

You will get all category IDs for that particular product in $categoryIds. But again I won't recommend to do this using Object Manager directly. Instead of doing this please create your block and pass detail from there and you can retrieve in this file.