best place to check available variables is in the download log for that specific host, on the start of dl its shown within printout, link/properties/download candidate used (premium account/free account/free), etc
but there is no standard in what names get used, in the past it was only for internal use, and now the package customiser access is really work around to give end users access to said data, vs formatting it into some standardised name/storable framework
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