Thank you for reaching out to Atlassian Community!
Searching for similar cases, I didn't find any use case that uses Jira Core for Customer Success.
If you want to allow your customers to create tickets and communicate with them, the best option is to use Jira Service Desk that has a portal where customers can access in order to create tickets. Also, in the customer portal, customers can view articles (in case you link a Confluence space to the project).
With that said, it will depend on what you want to share with customers and how you want to communicate with them. If you don't want them to report bugs or create tickets to ask for help and don't want to share a knowledge base with them, you can use Jira Core. It will really depend on your environment.
Feel free to share more details about your use case, so we can check what could be the better option.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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