Save Zip value is not working

MatteoSanna
Shopify Partner
1 0 0

Hi there!

I set up a checkout extension APP and I'd like to set zip value using extension API, specifically Addresses API with the function useApplyShippingAddressChange(). Apparently it seems working and if I try to read the shipping address through the checkout steps the zip value is correctly filled but once I placed the order the zip value has not been saved into the shipping Address. 

I can't understand what I'm doing wrong.

Can you please help me?

Thank you in advance.

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