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As we just announced the public beta release of BIM 360 Cost Management API at blog post, and I also prepared the 2 following samples to show the possibility that you can do with the API:
And for the developers who want have a quick test with Cost API, I also provided 2 Postman collection to help get started quickly, let me introduce each of them:
- Step-by-Step Tutorial: The collection includes 11 endpoints that help you to perform a basic workflow, including creating budget, contract, cost item, and also create different change orders attached with the cost item, and execute available actions on the change order.

- API List: The collection includes all the endpoints that are available in the current Public Beta release.
Please go to the github repo shown above to check the details, I am sure they will be helpful if you just start your journey with BIM 360 Cost Management API.

Enjoy your Forge journey;)