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Property names can be custom or defined by plugins. For example, to replace WebLogic installation folder you can use ${{FDWLS_WEBLOGIC_HOME}} which is defined by FlexDeploy WebLogic plugin. But if you want to replace something like URL to internal service, you can define something like MYCOMPANY_PAYMENT_SERVICE_URL on workflow as defined in Creating a Workflow and use it in your file as ${{MYCOMPANY_PAYMENT_SERVICE_URL}}. Defining custom property is entirely up to your implementation. For example, you can just define some prefix or suffix that changes through environments as a custom property instead of defining entire URL value.
With this one-time setup, the Property replacement allows various plugin operations will utilize the properties that are configured within FlexDeploy and allow deployment to any environment without manual changes to the files each time it is built for a different environmentto perform deployment to many environments using same artifact files.
For example, if your file contains string like
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