$storageAccount = "*******"
$tableName = "InstalledApplications"
$sasWriteToken = "********"  

# should be headers, because you use headers in Invoke-RestMethod
$headers = @{
    Accept = 'application/json;odata=nometadata'
 }


$pcname = $env:computername
$array = Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, Publisher, InstallDate,$customproperty1,$customproperty4 -unique


# RestAPI call begins
foreach ($apps in $array){
    $computername = $apps.ComputerName
    $appDisplayname = $apps.DisplayName
    $resource = "$tableName(PartitionKey='$computername',RowKey='$appDisplayname')"
    $tableUri = "https://$storageAccount.table.core.windows.net/$resource$sasWriteToken"
    
    $hash = @{
        PartitionKey = $computername 
        RowKey = $appDisplayname
        AppDisplayversion = $apps.DisplayVersion
        AppPublisher = $apps.Publisher
        AppInstallDate = $apps.InstallDate
        Location = $apps.Location
        Signature = $apps.SignatureKind
    }
    $body = $hash| ConvertTo-Json
    Invoke-RestMethod -Method PUT -Uri $tableUri -Headers $headers -Body $body -ContentType application/json
    }