
If you need an API starter, please read the API documentation. The developers resources page (http://www.clarizen.com/project-software-resources/for-developers.html) has some useful links to get you started. The documentation also contains basic samples.
Once you've connected to the (SOAP) API, you may use the GetWidgetUrlMessage to get a Clarizen project widget URL to embed. If, however you want to retrieve the projects information yourself, use the EntityQuery or WorkItemsQuery.
Also check this forum for more samples (like https://success.clarizen.com/hc/communities/public/questions/203993638-Query-on-project-type-field-in-c-).
If you have specific questions or issues we'll be happy to assist.
Hope this helps,
Ophir