Various fixes

Removed Commit Value as it is not a vaild param
Enabled ShouldProcess
Ensured mandatory default values make it into the body
Added Validate a valid VPG is selected.

ZertoApiWrapper/Public/Invoke-ZertoFailover.ps1

@@ -1,16 +1,18 @@
 <# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
 function Invoke-ZertoFailover {
-    [cmdletbinding()]
+    [cmdletbinding( SupportsShouldProcess = $true )]
     param(
         [Parameter(
             Mandatory = $true,
             HelpMessage = "Name of the VPG to Failover"
         )]
+        [ValidateNotNullOrEmpty()]
         [string]$vpgName,
         [Parameter(
             HelpMessage = "Checkpoint Identifier to use as the Point-In-Time to rollback to."
         )]
         [Alias("checkpointId")]
+        [ValidateNotNullOrEmpty()]
         [string]$checkpointIdentifier,
         [Parameter(
             HelpMessage = "'Rollback': After the seconds specified in the commitValue setting have elapsed, the failover is rolled back.
@@ -19,11 +21,7 @@ function Invoke-ZertoFailover {
             Default is the Site Settings setting."
         )]
         [ValidateSet("Rollback", "Commit", "None")]
-        [string]$commitPolicy,
-        [Parameter(
-            HelpMessage = "The amount of time in seconds the failover waits in a Before Commit state to enable checking that the failover is as required before performing the commitPolicy setting. Default is the Site Setting"
-        )]
-        [string]$commitValue,
+        [string]$commitPolicy = "Rollback",
         [Parameter(
             HelpMessage = "0: The protected virtual machines are not touched before starting the failover. This assumes that you do not have access to the protected virtual machines. -- DEFAULT
         1: If the protected virtual machines have VMware Tools or Microsoft Integration Services available, the virtual machines are gracefully shut down, otherwise the failover operation fails. This is similar to performing a Move operation to a specified checkpoint.
@@ -32,9 +30,9 @@ function Invoke-ZertoFailover {
         [ValidateSet(0, 1, 2)]
         [int]$shutdownPolicy = 0,
         [Parameter(
-            HelpMessage = "Time, in seconds, before VMs are forcibly turned off if the Force Shutdown option is seclected after attempting to gracefully shut down the VMs"
+            HelpMessage = "The amount of time in seconds the failover waits in a Before Commit state to enable checking that the failover is as required before performing the commitPolicy setting. Default is 60 Minutes (3600 Seconds)"
         )]
-        [long]$timeToWaitBeforeShutdownInSec = 300,
+        [int]$timeToWaitBeforeShutdownInSec = 3600,
         [Parameter(
             HelpMessage = "True: Enable reverse protection. The virtual machines are recovered on the recovery site and then protected using the default reverse protection settings.
             False: Do not enable reverse protection. The VPG definition is kept with the status Needs Configuration and the reverse settings in the VPG definition are not set."
@@ -43,15 +41,23 @@ function Invoke-ZertoFailover {
         [Parameter(
             HelpMessage = "Name(s) of VMs in the VPG to failover"
         )]
+        [ValidateNotNullOrEmpty()]
         [string[]]$vmName
     )
 
     begin {
-        $vpgId = $(Get-ZertoVpg -name $name).vpgIdentifier
-        $baseUri = "vpgSettings/{0}/failover" -f $vpgId
+        $vpgId = $(Get-ZertoVpg -name $vpgName).vpgIdentifier
+        if ( -not $vpgId) {
+            Write-Error "VPG: $vpgName Not Found. Please check the name and try again!"
+            break
+        }
+        $baseUri = "vpgs/{0}/failover" -f $vpgId
         $body = [ordered]@{}
+        # Setup Defaults
+        $body['commitpolicy'] = $commitPolicy
+        $body['TimeToWaitBeforeShutdownInSec'] = $timeToWaitBeforeShutdownInSec
         foreach ($key in $PSBoundParameters.Keys) {
-            if ($key -notlike 'vpgGroup' -or $key -notlike 'vmName') {
+            if ($key -notlike 'vpgName' -and $key -notlike 'vmName' -and $key -notlike 'WhatIf' -and $key -notlike 'TimeToWaitBeforeShutdownInSec' -and $key -notlike 'commitpolicy') {
                 $body[$key] = $PSBoundParameters['key']
             }
         }
@@ -65,7 +71,10 @@ function Invoke-ZertoFailover {
     }
 
     process {
-        Invoke-ZertoRestRequest -uri $baseUri -body $($body | ConvertTo-Json) -method "POST"
+        if ($PSCmdlet.ShouldProcess("$vpgName with identifier $vpgId and these options $($body | convertto-json)")) {
+            Invoke-ZertoRestRequest -uri $baseUri -body $($body | ConvertTo-Json) -method "POST"
+        }
+
     }
 
     end {