Failed to get Shipping rate from custom carrier App!! please help!!

Shopify Expert
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I need to clear my service environment and problems. Please check below:

 my custom app is installed on my developing webstore

  • APP(KshippingOP) installed


  • Carrier service(KshippingService) installed


  1. 3.jpg
  2. Here is the problem!!!!
  3. Problem
  • When customer checkout, It doesn’t show rate which my app service provide 4.jpg

You can see red box, It doesn’t show any rate which my carrier service provides except manual rate

  • When I go “store admin>setting>shipping >General shipping rates>my carrier service rate edit, and display that doesnt show any conditions like weight and price



As you see above, when I try to edit the rate with my custom App, the services should be provided do not show at all


Please help me here!!! this is killing me for weeks now!!! :((((((((