How to return response to a Shopify Webhook?

Question

I have a Salesforce site which is used as a rest resource for a Shopify Webhook for new Order Creation. When a new order is created in Shopify it hits the Url provided by us and expects a "200 OK" in response. How can I return the required response to the webhook. Here is the document which depicts the webhook requirement:- https://help.shopify.com/en/api/getting-started/webhooks#configuring-webhooks (Please review the "Responding to a webhook" section). Below mentioned is the code Snippet :-

@RestResource(urlMapping='/ShopSf/Odr')
global class ShopifyRestClass {
    @HttpPost

    global static String setName(){

      System.debug('>>>>>>in rest resource');

      RestResponse response = RestContext.response;
      response.statusCode = 200;
      System.debug('>>>>>>>>>>>>>response'+response); 
      ShopifyDataSync.ShopifySyncMethod(RestContext.request,'Order'); 

        return null;

    }

Answer 1

You have to set statuscode and response text blob in RestContext.response

 RestResource(urlMapping='/ShopSf/Odr')
    global class ShopifyRestClass {
        @HttpPost

        global static void setName(){

          System.debug('>>>>>>in rest resource');
          System.debug('>>>>>>>>>>>>>response'+response); 
          ShopifyDataSync.ShopifySyncMethod(RestContext.request,'Order'); 
          RestContext.response.statusCode = 200;
          RestContext.response.responseBody = Blob.valueOf('OK');    

        }

Src: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_restresponse.htm#apex_methods_system_restresponse