i'm using magento v2.4.1. I tried to add the product to the cart programmatically using salesrule_validator_process observer, this is to add a product if a cart rule being applied to the cart:

$quote = $observer->getEvent()->getQuote();
$productId = 15;
$qty = 1;
$product = $this->productRepository->getById($productId, false, $storeId);
$addResult = $quote->addProduct($product,$qty);
$newQuoteItem = $addResult;

The problem is this observer only fires at quote collect totals, so sometimes is not firing at the checkout cart page or checkout page, is there a way to include the collect totals at the checkout page or checkout cart page when the customer first visit the page ? is it safe to do this ?

1 Answer 1


This is not the safe way to do this:

you must add product using checkout_submit_before event.

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_submit_before">
        <observer name="quoteSubmitBefore" instance="namespace\module\Observer\QuoteSubmitBefore" />

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