Hi I need to insert a `Subscription_Order__c` and `OrderProduct__c` record in Salesforce using Rest Api. `Subscription_Order__c` has a lookup to `Account` and `OrderProduct__c`has a master detail relationship to `Product__c` and a lookup to `Account`. 

I need to be the one who input the Id of Account to `Subscription_Order__c` and the Product__c id to `OrderProduct__c`

This is my sample code. I was able to do this with newly created Account but I need to use an id of an existing account.

I already tried this 
`global static string doPost(id AccountID){` 
and then 
`wso.subscriptionOrder.Account__c = AccountId ;`
But it's throwing an `Unexpected parameter encountered during deserialization` error.


Your help is much appreaciated


 

@restResource(urlMapping='/buyproduct/*')
    global with sharing class buyProduct{
    
        private class OrderWrapper{
            Account account;
            List<subscriptionOrderWrapper> so;
        }
        private class subscriptionOrderWrapper{
            Subscription_Order__c subscriptionOrder;
            List<OrderProduct__c> orderProductList;
        }
        
        @HttpPost
        global static string doPost(){
              OrderWrapper container = (OrderWrapper)System.JSON.deserialize(
                RestContext.request.requestBody.tostring(), 
                OrderWrapper.class);
           System.debug('#####1' + container);
            
            Account acc = container.account;
            insert acc;
            System.debug('#####2' + acc);
           
            
            List<Subscription_Order__c> soInsert = new List<Subscription_Order__c>();
            for(subscriptionOrderWrapper wso : container.so){
                //wso.subscriptionOrder.Account__c = acc.id;
                //Account__c = Inputted id of existing account id request body
                soInsert.add(wso.subscriptionOrder);
            }
            insert soInsert;
            System.debug('#####3' + soInsert);
            
            list<OrderProduct__c> opInsert = new List<OrderProduct__c>();
            for(subscriptionOrderWrapper wso : container.so){
                for(OrderProduct__c orderProduct : wso.orderProductList){
                    orderProduct.Subscription_Order__c = wso.subscriptionOrder.Id;
                    //subcription_Product__c = Inputted id of an existing product__c in request Body
                    opInsert.add(orderProduct);
                }
            }
            insert opInsert;
            system.debug('#####4' + opInsert);
            return acc.Id;
        }
    }

This is my request body when I am having the `Unexpected parameter encountered during deserialization` error


   

{
    
    "so": [{
    "subscriptionOrder":{
    "Account" : 0016F00001sZtG0QAK
    }
    
    }]
    
    
    
    }