Calling SailPoint IdentityNow Private APIs (v1). Associated Blog https://blog.darrenjrobinson.com/integrating-with-sailpoint-identitynow-private-v1-apis-using-powershell/

Get-SailPoint-IdentityNow-PrivateAPI-ProfileList.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 = 'yourOrgName'
# IdentityNow Admin User and PWD to connect with via oAuth
$adminUSR = [string]"AdminUser1".ToLower()
$adminPWDClear = 'SuperStrongP@$$W0rdNOT!'
# Encrypt creds from above
$passwordHash = Get-Hash -Algorithm SHA256 -StringEncoding utf8 -InputObject ($($adminPWDClear) + (Get-Hash -Algorithm SHA256 -StringEncoding utf8 -InputObject ($adminUSR)).HashString.ToLower())
$adminPWD = $passwordHash.ToString().ToLower() 

# Base URI for Private API's (v1 APIs)  
$baseURI = "https://$($orgName).identitynow.com"
# URI to get Token 
$tokenURI = "https://$($orgName).identitynow.com/api/oauth/token?grant_type=password&username=$($adminUSR)&password=$($adminPWD)"
# Get Token
$token = Invoke-RestMethod -Method POST -Uri $tokenURI -Headers @{Authorization = "Basic $($encodedAuth)" } 
if ($token ) {
    try {
        # Private API Profile List
        $profiles = Invoke-RestMethod -Method GET -Uri "$($baseURI)/api/profile/list" -Headers @{Authorization = "Bearer $($token.access_token)"}
        $profiles
    }
    catch {
        write-host -foregroundcolor yellow "Well, that didn't work. Are you calling the correct API?"
    } 
}
else {
    write-host -foregroundcolor yellow "Well, that didn't work. Check your credentials, update and try again."
}