Hi Ayesha,

The challenge is expecting to make use of queueable interface. Please check the below code and it should help.

public with sharing class WarehouseCalloutService implements Queueable, Database.AllowsCallouts {  
   private static final String WAREHOUSE_URL = 'https://th-superbadge-apex.herokuapp.com/equipment';    
   public static void runWarehouseEquipmentSync(){
       Http http = new Http();
       HttpRequest request = new HttpRequest();
       request.setMethod('GET');
       request.setEndpoint(WAREHOUSE_URL);
       HttpResponse response = http.send(request);
       if(response.getStatusCode() == 200) {
           List<Object> jsonResponse = (List<Object>)JSON.deserializeUntyped(response.getBody());
           system.debug('~~ '+jsonResponse);
           List<Product2> productList = new List<Product2>();
           for(Object ob : jsonResponse) {
               Map<String,Object> mapJson = (Map<String,Object>)ob;
               Product2 pr = new Product2();
               pr.Replacement_Part__c = (Boolean)mapJson.get('replacement');
               pr.Name = (String)mapJson.get('name');
               pr.Maintenance_Cycle__c = (Integer)mapJson.get('maintenanceperiod');
               pr.Lifespan_Months__c = (Integer)mapJson.get('lifespan');
               pr.Cost__c = (Decimal) mapJson.get('lifespan');
               pr.Warehouse_SKU__c = (String)mapJson.get('sku');
               pr.Current_Inventory__c = (Double) mapJson.get('quantity');
               productList.add(pr);
           }            
           if(productList.size()>0)
               upsert productList;
       }        
   }    
   public static void execute(QueueableContext context){
       runWarehouseEquipmentSync();
   }
}

System.enqueueJob(New WarehouseCalloutService());