The authorisation guide here: https://developer-specs.company-information.service.gov.uk/guides/authorisation refers to the API Filing Functionality (bottom right of page) however both links (one for the OAuth guide and the other for API Filing functionality) lead to a 404 pages here (for the filing functionality)
https://developer-specs.company-information.service.gov.uk/manipulate-company-data-api-filing/reference
Is the end-point for filing live and if so could you please fix the links?