To check current user access rights on items, use the command core/check_items_billing:

svc=core/check_items_billing&params={"items":[<long>],
				     "accessFlags":<long>,
				     "serviceName":<text>}

While processing a request, available services and access rights on items are checked. For example, a user has a right to create POIs in some resource, however, according to service’s cost table, the limit of allowed POIs has been reached, so this resource will not be present in the result array.

[
	<long>		/* array of items that the user can access */
]