How can I get a list of users who can use a issue type to create issue by API in other plugin code？

[Li yongsheng]

I'm now developing a JIRA plguin.
When I know an issue type, I need to get a list of users who can use this issue type set by Issue Type Filters plugin.

Issue Type Filters Plugin :
https://marketplace.atlassian.com/apps/1211968/issue-type-filters-and-security?hosting=server&tab=overview

[Krister Broman [Advania]]

As far as their very minor documentation there is no API for that plugin. The JIRA API will not work with custom plugin function. The developer needs to add such functionality but I do not see that as likely in this case.

See Insight plugin:  https://documentation.mindville.com/display/ICV8/Insight+REST-API as an example on a plugin that has extended API functionality. 

I would say that your best bet is to directly contact the plugin or if its a plugin for your internal solution then hardcode the lookups to the JIRA API in the same way as your setup in system.