Issue with parsing the powershell variable into JSON array - json

Question

I'm using the following code to change a Pre-shared key for MEraki, however, at the moment I'm only able to do it statically.
I'd like to automate the code so that the PSK is an actual variable.
I've tried using the " or ' however in either scenario i'm unable to recall the variable into the array, and my end goal is to automate this script so that I can just run it and poof, off it goes.
[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12 -bor [System.Net.SecurityProtocolType]::Tls11
function Get-RandomCharacters($length, $characters) {
$random = 1..$length | ForEach-Object { Get-Random -Maximum $characters.length }
$private:ofs=""
return [String]$characters[$random]
}
function Scramble-String([string]$inputString){
$characterArray = $inputString.ToCharArray()
$scrambledStringArray = $characterArray | Get-Random -Count $characterArray.Length
$outputString = -join $scrambledStringArray
return $outputString
}
$password = Get-RandomCharacters -length 5 -characters 'abcdefghiklmnoprstuvwxyz'
$password += Get-RandomCharacters -length 1 -characters 'ABCDEFGHKLMNOPRSTUVWXYZ'
$password += Get-RandomCharacters -length 1 -characters '1234567890'
$password = Scramble-String $password
$newDailyPassword = $password
$newDailyPassword
#Meraki API KEY
$api_key = "API_KEY"
#Meraki Network URL
$network_id = "NETWORK_ID"
#Base API URL
$api = #{
"endpoint" = 'https://api.meraki.com/api/v0'
}
#API URL for SSID PSK Change XXX
$api_put = #{
"endpoint" = 'https://nXXX.meraki.com/api/v0'
}
$header_org = #{
"X-Cisco-Meraki-API-Key" = $api_key
"Content-Type" = 'application/json'
}
# PSK = New password
$data = #{
"psk" = $newDailyPassword **#----> I'd like this to be the new daily password variable. Is there a way to do this?**
}
#Convert data to Json format
$jbody = ConvertTo-Json -InputObject $data
#URL Network_ID and SSID number
$api.ssid = "/networks/$network_id/ssids/2"
#Combine base api_put URL and $api.ssid
$Merakiuri = $api_put.endpoint + $api.ssid
Invoke-RestMethod -Method Put -Uri $Merakiuri -Headers $header_org -Body $jbody -Verbose
EDIT1: I've managed to resolve this, by applying the concatination of the variable string, as I was parsing unexpected query via JSON (single string).
I've done the below.
$JsonJoiner = "'"
$passwordx = -join($JsonJoiner,$password, $JSonJoiner)
$newDailyPassword = $passwordx
now, whenever I parse the
$newDailyPassword
the correct value is parsed, and i'm able to generate the PW.