Unique token API load / performance test

Hello 

So I have this case in which I need to test around 100 users registering accident at the same time to if it can takes the load. However, here is the catch. 

Each user have unique token, these tokens are generated from API " Generate accident case", then that token needs to be added in " Register accident" API in order to register one accident successfully. 
Check image attached for details 

How do I do that ? Which video in Jmeter course explains this concept ? 

Thank you and best regards,