Zabbix API - Create Maintenance Window

if(!$credential){
    $credential = Get-Credential
}
 
$baseurl = '<Zabbix-Server-URL>'
$params = @{
    body =  @{
        "jsonrpc"= "2.0"
        "method"= "user.login"
        "params"= @{
            "user"= $credential.UserName
            "password"= $credential.GetNetworkCredential().Password
        }
        "id"= 1
        "auth"= $null
    } | ConvertTo-Json
    uri = "$baseurl/api_jsonrpc.php"
    headers = @{"Content-Type" = "application/json"}
    method = "Post"
}
 
$result = Invoke-WebRequest @params
 
 
 
$params.body = @{
    "jsonrpc" = "2.0"
    "method" = "maintenance.create"
    "params" = @{
        "name" = "Test-RHE"
        "description" = "Test-RHE-Beschreibung"
        "active_since" = 1494921600
        "active_till" = 1514826000
        "hostids" = @('10347')
        "groupids" = @()
        "maintenance_type" = 0
        "timeperiods" = @(
        @{
                "timeperiod_type" = 0
                "start_date" = 1494932400
                "period" = 3600
        })
    }
    auth = ($result.Content | ConvertFrom-Json).result
    id = 13
} | ConvertTo-Json -Depth 100
 
$result = Invoke-WebRequest @params
$result = $result.Content | ConvertFrom-Json