REST API - Create Account and populate custom fields

I'm able to create accounts successfully using this approach:

https://www.manageengine.com/products/passwordmanagerpro/help/restapi.html#addaccounts

I want to be able to create and account and at the same time populate some custom fields we have in our system. In the create resource section:

https://www.manageengine.com/products/passwordmanagerpro/help/restapi.html#createresource

It shows how you can create a resource and populate custom fields by adding the following to the JSON string:

"RESOURCECUSTOMFIELD":[
            {
               "CUSTOMLABEL":"Secure Resource",
               "CUSTOMVALUE":"YES"
            }...

  
   I've tried adding the following to the create account call:
  
  
   

  
  
   "ACCOUNTCUSTOMFIELD":[
            {
               "CUSTOMLABEL":"Secure Resource",
               "CUSTOMVALUE":"YES"
            }...
       
     I've However this does not seem to actually populate the custom field.  Anyone manage to get custom fields on accounts populated via the rest api??
    
    
     

    
    
     Thanks
    
    
     
Kevin