Help with Document API & Fetch a Document

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The API is authenticated using BASIC authentication, where the username is your API key, and the password is blank:

Basic access authentication

See also:

Getting invalid authorization

The existing XML Gateway API employs a custom authentication mechanism unique to Companies House, and involves the complex MD5 hashing of passwords and transaction ID’s. The new Companies House REST API uses standard [Basic HTTP Authorisation][1]. This makes API key authentication as simple as the following curl command: curl -v -uYOUR_APIKEY_FOLLOWED_BY_A_COLON: https://api.companiseshouse.gov.uk/company/00002065 You may have to do a little more work in code, depending on whether your client…

This is described on the Developer Hub page, with an example:

https://developer.companieshouse.gov.uk/api/docs/index/gettingStarted/apikey_authorisation.html