Error with Shopify CarrierService App response receiving

New Member
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Dear Shopify Community, 

I'm working on 3rd party CarrierService App based on Google Apps Script and carrier service  REST API. At this moment I use the development store type. CarriersService with callback URL has been successfully created and my app receives POST request and sends such response JSON:


"rates": [
"service_name": "Test Shipping Rate Provider",
"service_code": "MSSR",
"total_price": "18.5",
"description": "Special rates for multiple item quantity purchase",
"currency": "USD"