The present disclosure extends to methods, systems, and computer program products for integrating applications. In general, aspects of the invention can be used to reduce complexities associated with integrating applications and conserve computer system resources. Designed message processing functionality as well as updates and changes can be maintained through a centralized application message processing framework and then used by a plurality of applications. The centralized application message processing framework significantly reduces, and potentially eliminates, the need to incorporate message processing functionality individually into each of the plurality of applications. This in turn reduces the burden and complexity of maintaining message processing functionality for the plurality of applications.