It is quite hard to answer this question because you have not explained what you expect from a "call back url" in Jira.
When connecting Jira to another remote application, you usually have to define how that application works, so that Jira can understand how to talk to it. I would say exactly the same about the other application - it almost certainly needs to know how Jira works so that it cant talk to it.
I think we need to see more information on how your system works and what you mean by "call back url"
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