Extract all accounts on a SailPoint IdentityNow Source. Associated blog post is located here https://blog.darrenjrobinson.com/searching-returning-all-objects-users-from-a-sailpoint-identitynow-source/

Get all objects on an IdentityNow Source.ps1

#Install-Module psInlineProgress
# Your API Client ID obtained via IDN Admin Portal
$clientID = "zo7GG51uABCDEFwv"
# Your API Client Secret obtained via IDN Admin Portal
$clientSecret = "3Zm123d4sWish3Lva9yCX9DIfmwABCD"
$Bytes = [System.Text.Encoding]::utf8.GetBytes("$($clientID):$($clientSecret)")
$encodedAuth = [Convert]::ToBase64String($Bytes)
# Your IdentityNow Tenant Name
$orgName = 'CompanyX'
# SourceID of the Source to get objects from
# Navigate to the Source in the IdentityNow Portal and get the SourceID from the URL
# https://<orgName>.identitynow.com/ui/admin#admin:connections:sources
$sourceID = '36666'

# Search Identities
$accountsURI = "https://$($orgName).api.identitynow.com/v2/accounts?sourceId=$($sourceID)"
$searchLimit = "2500"

# Search for Users by Source
$idnObjects = $null 
if (!$idnObjects) {    
    # Get Base Users
    $idnObjects = @()
    $searchResults = Invoke-RestMethod -Method Get -Uri "$($accountsURI)&limit=$($searchLimit)&org=$($orgName)" -Headers @{Authorization = "Basic $($encodedAuth)" } 
    #"Search for accounts on SourceID: $($sourceID) returned $($searchResults.Count) account(s)"  
    if ($searchResults) {
        $idnObjects += $searchResults
    }

    $offset = 0
    do { 
        if ($searchResults.Count -eq $searchLimit) {
            # Get Next Page
            [int]$offset = $offset + $searchLimit 
            $searchResults = Invoke-RestMethod -Method Get -Uri "$($accountsURI)&limit=$($searchLimit)&offset=$($offset)&org=$($orgName)" -Headers @{Authorization = "Basic $($encodedAuth)" } 
            $searchResults.Count
            "Search for accounts on SourceID: $($sourceID) returned $($searchResult.Count) account(s)"  
            if ($searchResults) {
                $idnObjects += $searchResults
            }
        }
    } until ($searchResults.Count -lt $searchLimit)
    "Total accounts on SourceID: $($sourceID) is $($idnObjects.Count)" 
}

# Collection of Full User Objects
$fullUsers = @()
[int]$i = 0
write-host -ForegroundColor Yellow "Retrieving full user records"
foreach ($obj in $idnObjects) { 
    $i++
    #$global:user | Out-File $DebugFile -Append              
    if ($obj.id) {
        $userDetails = $null 
        $usrDetailsURI = "https://$($orgName).api.identitynow.com/v2/accounts/$($obj.id)?org=$($orgName)"
        $userDetails = Invoke-RestMethod -Method Get -Uri $usrDetailsURI -Headers @{Authorization = "Basic $($encodedAuth)" }         
        if ($userDetails) {
            $fullUsers += $userDetails
        }
    } 
    # PS ISE Progress Bar
    #Write-Progress -Activity "Retrieving User Object" -status "User $($obj.displayName)" -percentComplete ($i / $idnObjects.count * 100)
    # VS Code Progress Bar
    # get psInlineProgress using  Install-Module psInlineProgress
    # update line 36 of psInlineProgress.psd1 and change ConsoleHost to Visual Studio Code Host
    $percentComplete = $i / $idnObjects.count * 100
    Write-InlineProgress -Activity "Getting User Object $($obj.displayName)" -PercentComplete $percentComplete -ProgressCharacter '<' -ProgressFillCharacter '.' -ProgressFill '-'    
}
write-host -ForegroundColor Green "Retrieved full user records for $($fullUsers.Count) users"