The Localization Extensions developer preview is currently available. Localization extensions allow partners and app developers to access the tax id that is collected during checkout and use this information to augment shipping apps (expedite customs clearance) and invoicing apps (issue goverment invoices).
Starting in the 2020-07 release candidate, orders made through checkout in countries that require a tax id for customs clearance or government invoicing will have this information available through the REST and GraphQL API.
You can try these APIs by using a development store with the 'Localization Extensions' developer preview enabled.
For more information on how to apply tax IDs on checkout and view them through the GraphQL API, read to our localization extenson tutorial.
For any questions and discussion regarding the Localization Extensions developer preview, visit our forum post.