Shortcuts is an underappreciated way to wire up Apple products with third party APIs without writing custom code. I've found can muck with request headers and satisfy whatever authorization scheme most APIs expect, too.
Within 30 minutes of getting API access to GPT-4, I'd wired it up to the Action Button on my Apple Watch for Japanese language practice.
I started a screencast series last week, and I can call it a series now because there's a second one.