Systems and methods allow a mobile carrier to inform a content provider of data flow restrictions associated with a subscriber's account so that the carrier and the content provider can cooperate to limit data flows without resorting to the inefficiencies of throttling by the carrier. A network device for the carrier network sends, to a third-party content platform, a client message including a first dedicated subscription parameter extension. The first extension indicates one or more subscription parameters for a data flow between user equipment and the third-party content platform. The network device receives, from the third-party content platform, a server message including a second dedicated subscription parameter extension. The second extension confirms the third-party content platform will abide by the subscription parameters. The network device generates, based on the subscription parameters, a policy enforcement rule for the data flow that relies on cooperation of the third-party content platform.