You can find the projectId when you click on your project and copying the Project ID at the top of the Traces table. You will need a team level API key which can be generated by navigating to the Home page and clicking Settings -> API Keys -> Generate API Key.
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A complete list of supported parameters for the POST project api key endpoint is provided below.

project_Id
string
required

ID of your project. This can be found on the langtrace ui.

apiKey
string

Project api key