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Post functions can be used to automate tasks and ensure consistent data quality by eliminating or at least minimizing human error.
Jira ships with built-in post functions but those are limited. JWT for Jira Cloud extends that list by offering custom post functions.
All post functions, as opposed to conditions and validators, use the power of the expression parser to to get you the data you need, when you need it.
If you still have questions, feel free to refer to our support team.