Magento - Change customer tax class id dynamically to affect existing order -

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is possible dynamically update customer_tax_class_id attribute of oder being processed - guest customers.

i have tried setting via checkout/session model not update.

the goal reset tax amount based upon condition 0. using tax_class_id have rule of 0 tax.

you should before order submitted, user pays correct amount first time (and has no surprises). there reason cannot determine tax_class in advance?


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