LAANC authorization is what you need from the FAA and you'll need to research how to get DJI Unlocks:
Self Unlock
and/or
Custom Unlock
You should have been exposed to these things when you were studying for your Part 107.
Unfortunately, the study material and test for the 107 don't go into the "how's" of getting permission, just the you are required to.
And they never mention the DJI part at all. Nor should they.
For many, this is a daunting task, given that people complain constantly about how it doesn't work. But if you follow the link that Al posted above DFDigital, you should be golden.
For the custom unlock, you'll need to get a LAANC request if they're LAANC active, or if not, an email from the airport with an FAA.gov email address. When I need to send an email along with my custom unlock, I save it as a PDF and include that in the unlock request.
Also, remember that you cannot have more than one unlock active at any one time. And, once you're done flying and have left the area, don't forget to turn it off before you try and fly again elsewhere. I've had two different people contact me in the last three days asking for help getting their drone in the air. They had just flown in an NFZ, and didn't turn if off once they left. The can't fly outside the unlock area until you turn off the unlock.
Good luck, it sounds like a fun gig.