check_authorization.php

<?php

define('BOT_TOKEN', 'XXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXX'); // place bot token of your bot here

function checkTelegramAuthorization($auth_data) {
  $check_hash = $auth_data['hash'];
  unset($auth_data['hash']);
  $data_check_arr = [];
  foreach ($auth_data as $key => $value) {
    $data_check_arr[] = $key . '=' . $value;

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@JsonIgnoreProperties(ignoreUnknown = true)
data class TelegramAuthRequestDTO(
    @JsonProperty("auth_date")
    val authDate: Long,

    @JsonProperty("first_name")
    val firstName: String?,

    @JsonProperty("last_name")
    val lastName: String?,