Get Document Id's that satisfy the condition in a Query - node.js

Question

I want to get document id which satisfies a given query in cloud firestore.
The schema for my database is like this
deyaPayusers/AuthId
/user details
PhoneNo:
/Wallet
/Transaction
I know PhoneNo, then is there a way to get the corresponding AuthId.
I implemented my idea as described below and I'm encountering this error
Argument "documentPath" is not a valid ResourcePath. Path must be a
non-empty string.
const functions = require('firebase-functions');
const Firestore = require('#google-cloud/firestore');
const firestore = new Firestore();
const admin = require('firebase-admin');
exports.transactionDetails = functions.firestore
.document('deyaPayusers/{authid}/Transaction/{authid1}')
.onWrite(event=>{
const db1 = admin.firestore();
const MAuth = event.params.authid
const transid = event.params.authid1
var payeeDocId
var newValue = event.data.data();
var payee = newValue.Payee;//Phone number of money receiver
var amt = newValue.Amount;//Amount willing to pay to payee(money receiver)
var usersRef = db1.collection('deyaPayusers').doc(MAuth);//Refers to payer doc
var payer = usersRef.PhoneNo;//Gets Phonenumber attribute of payer
const walletRefPayer = db1.collection('deyaPayusers').doc(MAuth).collection('Wallet').doc(MAuth);//Wallet reference of Payer
var walletAmt = walletRefPayer.Usd//Accessing the total amount of a person(payer) stored in the wallet
//Getting the payee details assuming, payee has an account in DeyaPay else we need to send the invite to the payee
var payeeInfo = db1.collection('deyaPayusers');//Query to retrieve the payee details from his phone number
let payeeQuery = payeeInfo.where('PhoneNo','==',payee)//We are retrieving it here,before checking the condition because we need to update the transaction details with status either it is failure or success
.get()//To get the doc ID of the Payee based upon the PhoneNo
.then(snapshot => {
snapshot.forEach(doc=>{
payeeDocId = doc.id;
}
});
/*.catch(err =>{
console.log('Error getting documents',err);
});*/
//const docID = payeeQuery.getId();//Gets the Document ID of the payee with the above phone number,in our case it is Authenticated ID.
var payeeWalletRef = db1.collection('deyaPayusers').doc(payeeDocId).collection('Wallet').doc(payeeDocId);
if(walletAmt>=amt){
//Write transactions here,becuase both actions(increment and decrement) must complete together
var payeeTransaction = db1.runTransactions(pT=>{
return pT.get(payeeWalletRef)
.then(doc =>{
var payeeDoc = doc.data(Usd)+amt;//Crediting the amount to be added
return pT.update(payeeWalletRef,{
Usd:payeeDoc});//end of update
})
})//end of payeeTransaction
var payerTransaction = db1.runTransactions(ev=>{
return ev.get(walletRefPayer)
.then(doc=>{
var payerDoc = doc.data(Usd)-amt;//Debitting the amount to be transfered
return ev.update(walletRefPayer,{
Usd:payerDoc});//end of update
});//end of then for payerTransaction
})//end of payerTransaction
}
});//onWrite() end

Answer 1

.document('deyaPayusers/{authid}/Transaction/{authid1}')
You aren't properly interpolating this string.
You need
.document(`deyaPayusers/{authid}/Transaction/{authid1}`)
Also, if you're coming here from google. Any non-string parameter to .document will result in this exception as well.