Fetch items of collection AND its subcollection using API

Hi,

given this collection structure:

```
collection1/
/item1

./subcollection1
../item2

./subcollection2
../item3
```

I want to fetch all of item1, item2 and item3 in one GET command.

I tried:
` 188BET靠谱吗https://api.zotero.org/users//collections//collections&key=`
It returns the dictionary listing all entries in `collection1`, including `subcollection1` and `subcollection2` but DOES NOT include `item2` and `item3`.

I tried:
` 188BET靠谱吗https://api.zotero.org/users//collections//collections&key=&format=bibtex`
which returns an error.

I consulted these resources: 188BET靠谱吗//www.brodersterzo.com/support/dev/web_api/v3/start

I am thankful for any help.

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