Additionally, mentioning that some institutions or libraries might provide access if the user is affiliated with an educational institution or a company that has subscriptions could be helpful. Also, advising them to contact API directly for details on pricing and purchasing steps is important. Maybe include a link to the API standards page so they can navigate there themselves.
The official, up-to-date version is available for purchase and secure digital viewing through the API Webstore API Compass platform Official Document API Specification 6A, 21st Edition Latest Updates : Includes (October 2024) and Addendum 4 api specification 6a 21st edition pdf link
