Unable to ingest JSON data into Azure Event Hub - powershell

Question

I wrote the below Powershell script to get the JSON data from an API endpoint (https://data.melbourne.vic.gov.au/resource/vh2v-4nfs) and then write this data in JSON format to Azure Event hub. I am able to successfully get the data from the endpoint however the data is not getting ingested into Azure Event Hub.
Can anyone please let me know what's wrong with the below code:
$url = "https://data.melbourne.vic.gov.au/resource/vh2v-4nfs"
$apptoken = "k7lQcUCVFoROv7rQh9fSSXMkZ"
# Set header to accept JSON
$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Accept","application/json")
$headers.Add("X-App-Token",$apptoken)
$results = Invoke-RestMethod -Uri $url -Method get -Headers $headers
$results
$method = "POST"
$URI = "https://YOURNS.servicebus.windows.net/eh-streetparking/messages"
$signature = "SharedAccessSignature sr=YOURNS.servicebus.windows.net%2feh-streetparking&sig=K6bfL1VjW9FUcL0B5xaI%3d&se=16722&skn=eh-sap-streetparking"
#$authInfo = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("$signature"))
# API headers
$headers = #{
"Authorization"=$signature;
# "Content-Type"="application/json;type=entry;charset=utf-8";
"Content-Type"="application/json";
}
# execute the Azure REST API
foreach ( $result in $results)
{
Invoke-RestMethod -Uri $URI -Method $method -Headers $headers -Body $result
}

Answer 1

The value you have presented as the return result from your Invoke-RestMethod is actually a deserialized PowerShell object, not JSON. It appears to be having its quotes removed at some point too.
PSObject ($results) looks like this: $x = #{account_id="12345"; username="12345"; is_locked="False"; employee_id="12345"; first_name="John"; middle_initial="Roger"; last_name="Doe"; full_name="John Roger Doe"}
You can do this to access individual values:
$x.full_name
Finally, follow this syntax to send POST request:
$Cred = Get-Credential
$Url = "https://server.contoso.com:8089/services/search/jobs/export"
$Body = #{
search = "search index=_internal | reverse | table index,host,source,sourcetype,_raw"
output_mode = "csv"
earliest_time = "-2d#d"
latest_time = "-1d#d"
}
Invoke-RestMethod -Method 'Post' -Uri $url -Credential $Cred -Body $body -OutFile output.csv