post https://api.butterflymx.com/v4/access_tools/pins
Create a PIN access tool.
PINs have strict complexity requirements. They can't be
sequences (like 123456 or 654321), or repeated numbers
(like 111111 or 222222), and some additional rules apply.
If a PIN has 4 digits then the above rule doesn't apply. 4-digit PINs
are grandfathered in and require people to enter a Unit label along with
their PIN to be granted access.