SyncMadeEasy/force-app/main/default/classes/DeleteCustomerFromShopifyAuthentication.cls

@RestResource(urlMapping='/DeleteCustomerFromShopifyAuthentication/*')
global with sharing class DeleteCustomerFromShopifyAuthentication {    
    @HttpPost
    global static void updateCustomerWithAuthentication(){      
         //Deprecated
       //Class no longer exists       
    }   
}