For bugs and problems with the API, use Github issues. For general discussion and help, see the Google group.
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Request Formats - How to get data into and out of the server.
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Making authenticated API calls - Any API calls that write data or access private information must be authenticated.
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Support, help and feedback - What to do if you have problems, need help or have feedback.
Head here if you're looking for information on specific calls. These documents presume you know how to formulate requests and supply parameters to the server.