What is the use of service_code in response field of CarrierService api?

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Hi everyone, I am developing a Shopify app and I am using CarrierService API. In the documentation in the response field, I saw the below field.

service_code : A unique code associated with the rate.

I am not able to figure out what is it and can I change it for every request made to get the estimated rates?

Thank you!!!!