CORS preflight (checkout sessions)OPTIONS/ucp/checkout-sessionsResponses200CORS preflight response Try itServerBase URL/Custom base URLOverrides the selected server when set.SendRequestcURLJavaScriptPythonCopyCopiedcurl -X OPTIONS '/ucp/checkout-sessions'const response = await fetch("/ucp/checkout-sessions", { method: "OPTIONS" });import requests response = requests.options( "/ucp/checkout-sessions", )Response200CORS preflight response