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You need to follow below steps to save custom field value. Below code will be work for both the login and guest user. Also please create field in "quote_address" and "sales_order_address" table first. Here i have shown you code according to the field "customtype". Please change field according to yours. Step 1:- Create file ...


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Please follow the below blog https://meetanshi.com/blog/change-shipping-price-on-address-field-change-in-magento-2-custom-shipping-method/ this is helpfull for you to refresh shipping rate when change zipcode and country


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