Capture raw request for courier track callbacks regardless of Content-Type and persist contentType/rawBody/query into log_third_party for empty-body diagnosis.
Co-authored-by: Cursor <cursoragent@cursor.com>
Enable urlencoded body parser, return XFX {code,message} without API envelope, and harden callback payload parsing.
Co-authored-by: Cursor <cursoragent@cursor.com>