CODE EXAMPLE FOR PHP

wordpress basic auth

Request: GET https://<domain-name>/wp-json/wp/v2/posts
Header: Authorization : Basic base64encoded <username:password>

Sample request: GET https://<domain-name>/wp-json/wp/v2/posts
Header: Authorization : Basic eGw2UllOdFN6WmxKOlNMRWcwS1ZYdFVrbm5XbVV2cG9RVFNLZw==
Example =>  username : testuser and password : password@123