Develop plug-in that invokes a web application

Good morning.
I need to develop an web application to quote and invoice.
This web application I want to invoke from my SD jira as a plug-in.
What kind of plug-in should I develop?
Some example you can send me.
Thank you.

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I hope you’ve already looked at what exists on the Marketplace. A quick search turned up this nugget:

But if that won’t suffice, the best place to get started is the JIRA Service Desk Development Guide.