How to give org A to create tickets in orgs B,C,D.. accounts (rest api)

[The Null Pointer _]

Hi,

I want to build a service that should have permissions to create jira tickets in other jira accounts via REST API.

Let's say the service is A and other orgs (where I want to create jira tickets) are B, C, D, E ... 

I imagine a flow like this:

- admin of org B visits my webpage (service/org A)

- admin click on button or something and admin is taken to his/her org's jira page

- admin grants permission to my service/org A

- my service (A) receives and saves the auth token in the database

- my service can now create jira tickets in org B via REST API using the auth token

Repeat the same for other orgs (C, D, E, ...)

Can someone please point me to some documentation or example flow that shows how to implement above? 

Thank you!