Edit: Sorted now, used another browser.
Your piston works fine. Did you remember to create the three global variables (@accessToken, @tokenExpiration, and @vehicleID)? Make sure the names match exactly, including capitalization.
I’ve edited the green image now!
How do I create the global values? I’m not sure I did I thought I only needed to add my e-mail and password.
Edit: Ahhh you need to add those to the “global variables” box in the top right. Now it makes sense! Thanks