update_plan
To assign a billing plan, use the account/update_plan method:
svc=account/update_plan¶ms={"itemId":<long>,
                "plan":<text>} 
Parameters
The request must contain the following parameters:
| Parameter | Description | 
|---|---|
| itemId | Resource (account) ID. | 
| plan | Billing plan name. | 
Response
If the plan is assigned successfully, an empty object is returned.
Otherwise, an error code is returned.