I had a working checkout on 3.9.1 but this is no longer working on 3.9.2.
I’m now using Custom Reference (I think 3.9.1 it was just Reference).
What the stripe checkout payload contains:
The error received:
My checkout.session on the server:
Did something change on the 3.9.2 update?
This price id shown in the payload is a valid price id from stripe.