The price of a particular Category be excluded from the minimum order amount

Question

How can the price of a particular Category be excluded from the minimum order amount in Magento 2.3 I'm wondering how to approach this problem?

Answer 1

The base method to calculate the minimum amount is found here vendor/magento/module-quote/Model/Quote.php in the function validateMinimumAmount().

Then most likely if you use standard shipping the minimum order amount verification is made here vendor/magento/module-quote/Model/Quote/Address.php in the function validateMinimumAmount().

return $includeDiscount ?
        ($this->getBaseSubtotalWithDiscount() + $taxes >= $amount) :
        ($this->getBaseSubtotal() + $taxes >= $amount);

Now you have multiple possibility to create your custom calculation in an after plugin on this method.

1 : You can add a new field to the quote that contains the the base subtotal in which you exclude products from that category. This would be the best way to do it but it is a little bit complicated.

2 : The second way to do this would be to make your own calculation in the after plugin by loading all quote items and sum up the price of the available items and see in the end if your new subtotal is >= than the minimum amount for shipping.