Hello Adam,
Thank you for your question.
As our R&D team manages API-related questions, please let me suggest to post your API-related questions on our Developers forum: https://clarizen.zendesk.com/forums/22177967-Developers, so that our developers can answer your API questions in a much faster manner.
In the meantime, here is the Clarizen Web Services Guide: Provides principles and rules of API usage, an overview of API concepts as they relate to the Clarizen data model, and sample code as a learning reference > https://www.clarizen.com/project-software-resources/for-developers.html.
All the best,
Diana