Some state or province codes exceeds the limit of 2 characters

Still cannot find a list of two letter codes anywhere. The ISO documents are all 2-3 letter codes. Fedex publishes some but not all at https://developer.fedex.com/api/en-us/guides/api-reference.html#canadapr...

There doesn't seem to be a problem truncating codes to 2 characters as a fallback

$fedex_rest_address->setStateOrProvince($address->getAdministrativeArea())

to

$fedex_rest_address->setStateOrProvince(substr($address->getAdministrativeArea(),0,2))

So I got in contact with the API team and they told me that state code is required for US, CA, PR and not required for other countries. The field can just be left blank if it's not one of the countries that require it.