1. A computer-implemented method, comprising: under the control of one or more computer systems that execute instructions, detecting data addressed from a first application executing on a first computer system to a second application, the first application and the second application being members of an application group; making a determination whether the second application is deployed to the first computer system or to a second computer system different from the first computer system; and processing the data in accordance with the determination, including: on a condition that the second application is deployed to the first computer system, causing the data to be routed, via a proxy entity deployed to the first computer system, to the second application; and on a condition that the second application is deployed to the second computer system: determining one or more operations to perform on the data, the one or more operations specified as part of credentials information usable to facilitate communication among the members of the application group; and causing the data to be routed, via a network, to the second application.