Firestore: REST API call to runQueries - firebase

Question

URL:https://firestore.googleapis.com/v1/{parent=projects//databases//documents}:runQuery
Request body:
{ structuredQuery:
{ from: [
{ collectionId: 'questions'
}
],
orderBy: [
{ field:
{ fieldPath: 'created'
}, direction: 'DESCENDING' }
], select: { fields:
[
{ fieldPath: 'id' },
{ fieldPath: 'details' },
{ fieldPath: 'question' },
{ fieldPath: 'votes' }
]
},
where: {
compositeFilter: {
filters: [
{ fieldFilter: {
field: {
fieldPath: 'author'
},
op: 'EQUAL',
value: {
stringValue: "henry"
}
}
}
], op: 'AND'
}
},
limit: 4
}
}
What error do I get?
[{
"readTime": "2022-12-26T12:46:55.107240Z"
}]
the response isn't returning the expected results
What am I trying to do?
Fetch the given field from the collection: "questions" where the "author" matches "henry"

Answer 1

The documentation is available and it looks pretty straighforward.
Making REST calls
All REST API endpoints exist under the base URL https://firestore.googleapis.com/v1/.
To create a path to a document with the ID LA in the collection
cities under the project YOUR_PROJECT_ID you would use the
following structure.
/projects/YOUR_PROJECT_ID/databases/(default)/documents/cities/LA
To interact with this path, combine it with the base API URL.
https://firestore.googleapis.com/v1/projects/YOUR_PROJECT_ID/databases/(default)/documents/cities/LA
The best way to begin experimenting with the REST API is to use
the API Explorer, which automatically generates Google Identity OAuth
2.0 tokens and allows you to examine the API.