TexnoPHP

<?php
define('API_KEY', '');  //Bot tokeni


function bot($method, $datas = [])
{
  $url = "https://api.telegram.org/bot" . API_KEY . "/" . $method;
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $datas);
  $res = curl_exec($ch);
  if (curl_error($ch)) {
    var_dump(curl_error($ch));
  } else {
    return json_decode($res);
  }
}

@$update = json_decode(file_get_contents('php://input'));
@$message = $update->message;
@$chat_id =  $message->chat->id;
@$text =  $message->text;
@$mid =  $message->message_id;
bot('setMessageReaction', [
  'chat_id' => $chat_id,
  'message_id' => $mid,
  'reaction' => json_encode([[
    'type' => 'emoji',
    'emoji' => '👍'
  ]]),
]);

?>