Programmatically set tax in Magento - php

Question

I am calculating the tax for the entire order using a third party API.
How can set total tax rate to a quote ?
$quote->setTax($taxAmount); is not working.
can anybody please help ?

Answer 1

That's how you should do it:
Change the file app/code/Vendor/Package/etc/di.xml in your custom package by adding the line
<type name="Magento\Checkout\Model\Cart">
<plugin name="interceptAddingProductToCart" type="Vendor\Package\Model\Checkout\Cart\Plugin" sortOrder="10" disabled="false"/>
</type>
Create the plugin
app/code/Vendor/Package/Model/Checkout/Cart/Plugin.php
Now, add the content to the file above:
<?php
namespace Vendor\Package\Model\Checkout\Cart;
class Plugin
{
/**
* #var \Magento\Quote\Model\Quote
*/
protected $quote;
/**
* Plugin constructor.
*
* #param \Magento\Checkout\Model\Session $checkoutSession
*/
public function __construct(
\Magento\Checkout\Model\Session $checkoutSession
) {
$this->quote = $checkoutSession->getQuote();
}
public function beforeAddProduct($subject, $productInfo, $requestInfo = null)
{
# Do something, here for instance, it remove TAX for giftvouchers
if ($productInfo->getTypeId() == 'giftvoucher') {
$productInfo->setTaxClassId(0);
}
return [$productInfo, $requestInfo];
}
}