Delete SailPoint IdentityNow Objects from a Source. Associated Blog Post https://blog.darrenjrobinson.com/lifecycle-management-of-identities-in-sailpoint-identitynow-via-api-and-powershell/

Delete Objects from a Source.ps1

# Your API Client ID
$clientID = 'yourClientID'
# Your API Client Secret
$clientSecret = 'yourClientSecret'
$Bytes = [System.Text.Encoding]::utf8.GetBytes("$($clientID):$($clientSecret)")
$encodedAuth = [Convert]::ToBase64String($Bytes)
# Your IdentityNow Tenant Name
$orgName = 'yourTenantOrgName'
# Search URI
$URI = "https://$($org).api.identitynow.com/v2/search/identities?"
# Delete Base URI
$deleteBaseURI = "https://$($org).api.identitynow.com/v2/accounts/"
# Search Query for Accounts to Delete 
$query = 'familyName EQ Sanchez'
# Search Accounts
$searchResults = Invoke-RestMethod -Method Get -Uri "$($URI)limit=$($searchLimit)&query=$($query)" -Headers @{Authorization = "Basic $($encodedAuth)" } 
$searchResults.Count
write-host "$($searchResults.Count) found"

if ($searchResults.Count -gt 0) {
    foreach ($identity in $searchResults) {
        $id = $null 
        Write-host "Deleting $($identity.displayName)"
        foreach ($account in $identity.accounts) {
            If ($account.source.name.Equals("External Entities")) {
                $id = $account.id 
            }
        }
     
        if ($id) {
            $deleteURI = "$deleteBaseURI$($id)?org=$($orgName)"

            try {
                Invoke-RestMethod -Uri $deleteURI -Method Delete -Headers @{Authorization = "Basic $($encodedAuth)"; 'Content-Type' = 'application/json' }             
            }
            catch {
                write-host -forgroundcolor yellow "Well, that didn't work. Check your script"
            }
        }
    }
}