GET /cart/prepare_shipping_rates and /cart/async_shipping_rates without using province

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I am using these two endpoints to retrieve shipping rates. However, I would like my customers to not be required to fill in the Province field (ie. I want to pass an 'accept-all' value into the Province) such that the zip codes can be recognised without having the input the province. For example, 8042 in New Zealand refers to the Canterbury province and I want customers to only have to input the zip code (8042) without the province (Canterbury).


Is this possible?


Thank you!