This page describes the authentication flow and endpoint specs.
The PPTX Builder API uses tokens in order to authenticate requests. In order to get an API Token you will need to be registered in https://api.pptxbuilder.com.
Authentication to the API is performed via HTTP Basic Auth. Provide "username:password" in base64 encoding as basic auth. You will have to provide your company key in the body of the request (you can find it in the company section).
The Token is valid for 7 days. After 7 days of inactivity token will be marked as expired.