<userID>in later steps.<privateKey>.<userID> and <privateKey> in the following
https://api.zotero.org/users/<userID>/collections?key=<privateKey>. "data": {
"key": "<collectionKey>",
"version": 2661,
"name": "<collectionName>",
"parentCollection": false,
"relations": {}
}
<collectionName> is the name you provided to individual folder in your library and <collectionKey> is the corresponding key.<collectionKey>.https://api.zotero.org/users/<userID>/collections/<collectionKey>/items?key=<privateKey>&format=bibtex*.bib file of your selected folder.Happy Writing!