Open a ticket, track its status, and find answers to the questions that come up most often.
Submit a support ticket from this page with a category, a priority, and a description of what you were doing when the problem occurred. Signed-in users can follow the ticket thread and see replies in place. Include the exact request bytes and the response you received whenever the issue is protocol-related — it is almost always the fastest route to a diagnosis.
Most protocol questions are answered in the documentation. Each service has a reference page covering its request and response layout, the sessions and security levels it requires, and every negative response code the simulator can return for it. The Learning Center covers the same ground in tutorial form.
Subscription, invoice, and refund questions are handled through the same ticket queue. Include your invoice number or payment ID so the request can be matched to your account without a round trip.