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Look in ps_emailalerts / ps_emailers.php for the function:

public function hookActionUpdateQuantity($params)

You need to know the product id and possibly the product attribute id.

Then you can use other functions.

So if I don't know how to import, I can't give you more precise instructions.

Look in ps_emailalerts / ps_emailers.php for the function:

public function hookActionUpdateQuantity($params)

You need to know the product id and possibly the product attribute id.

Then you can use other functions.

Look in ps_emailalerts / ps_emailers.php for the function:

public function hookActionUpdateQuantity($params)

You need to know the product id and possibly the product attribute id.