Is there a way to add user defined fields when creating a collection via the zotero api ?

I tried to add a coursid field when creating a collection with post

{
"name" => $c->[2] . " " . $c->[0],
"parentCollection" => $domkey,
coursid => 1234,


};

but the collection is not created. Can I add tag(s) to a collection ?
Thanks
François
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