Abstract: Improved messaging systems are disclosed. Embodiments allow message producers to access or create producer reservations in a queue coordination data store corresponding to a campaign. The producer reservations reflect a workload and a campaign aspect. A message producer can apply a usage strategy in resource selection which may optimize selection of queueing resources considering existing work volume for those message queues or aspects of the campaign. Message consumers may select message queues from which to consume messages using data in the queue coordination data store. A message consumer may apply a usage strategy in resource selection which may optimize selection of queueing resources considering existing work volume for those message queues or aspects of the campaign.

Abstract: Notification systems and methods that combine the generation and delivery of notifications with the ability to dynamically select or render content for those notifications are disclosed. The selection of what content to include in such notifications, or the rendering of such content, may be performed at or after a time of the delivery of the notifications to users.

Abstract: A subscriber management system and method are described, according to various implementations. In an implementation, the method and system generate a unique user device identifier that is stored and accessed in storage on a user device. The user device identifier is passed in network requests when visiting a website having an installation of a module of the subscriber management system.

Abstract: A subscriber management system and method are described, according to various implementations. In an implementation, the method and system generates a unique user device identifier that is stored and accessed in storage on a user device. The user device identifier is passed in network requests when visiting a website having an installation of a module of the subscriber management system.