pinpon is a gateway for various cloud notification services, such as the Amazon AWS SNS service. Think of pinpon as a hub for dispatching notifications originating from multiple notification sources. Clients of the pinpon service create topics and send notifications via the REST-ish pinpon service, and the pinpon server takes care of the per-service details and communicating with the upstream cloud services. Advantages of this approach, compared to programming directly to the individual notification services' interfaces, are: A common API for all supported notification services. The secret credentials required to communicate with each cloud notification service can be kept in a central location (namely, the pinpon server), rather than being distributed to each notification source host, therefore reducing the attack surface. Hosts which send notifications via the pinpon gateway can be firewalled from the public Internet. This is especially useful in IoT applications. Currently-supported notification services: Amazon AWS SNS