I notice that everytime I change Country, State/Province in checkout page, it reloads the Shipping Methods section. Depending on the country/state, it would be 1 or 2 shipping methods.

If I choose UK, there is only 1 shipping method

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If I choose US; there is 2 shipping methods enter image description here

I wonder how it can listen to the input changes and which function in checkout module updates shipping methods. Could you guys show me?


The below file is resposible for this shipping estimation functionality.


Here has the method like:

  1. estimateByAddress
  2. estimateByExtendedAddress
  3. estimateByAddressId
  4. getEstimatedRates
  5. getShippingMethods
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