Install-Module PSTelegramAPI -Scope CurrentUser

Import-Module PSTelegramAPI

# Establish connection to Telegram
$TLClient = New-TLClient -apiId $ENV:TLApiId -apiHash $ENV:TLApiHash -phoneNumber $ENV:TLPhoneNumber

# Get List of User Dialogs
$TLUserDialogs = Get-TLUserDialogs -TLClient $TLClient

# Get latest 100 messages from each User in List
ForEach ($User in $TLUserDialog) {
    $TLHistory = Get-TLHistory -TLClient $TLClient -Peer $User.Peer -Limit 100
}

# Find a specific User
$TLPeer = $TLUserDialogs.Where({ $_.Peer.Username -eq 'mkellerman' }).Peer

# Send message to User
Invoke-TLSendMessage -TLClient $TLClient -TLPeer $TLPeer -Message 'Hello World'