Point-to-point integration is a very common solution that you can find in literally every organization.

Point-to-point is an overloaded term that is used in many areas, such as communication, networking, and messaging. In system integration, by point-to-point architecture we usually mean direct connection between applications. The calling application should know the exact address of the application it invokes and the parameters to pass. All this information is usually configured or even hard-coded. The applications can be located on the same computer or in datacenters on different continents.

In a small corporation that uses a few applications that require integration, such as a payroll application, a lead management system, a customer relation management system, and a few others, this approach seems to be the simplest one. These rarely change their interfaces, and new applications are not acquired often. Therefore, connecting an application to another one using...