creating simple plugin that award woowallet credit based on mycred points [closed]

I am very new to coding and to wordpress development and was trying to create a simple plugin that allows admin to award users that has Mycred points some woowallet credit
Points X admin value = amount added to wallet

so i searched and tried for a few days and came up with this code that doesn’t work … Please help

function process_coins_earning_to_wallet()
{

if (isset($_POST['AddCredit'])) {

    if (!current_user_can('administrator')) {
        return __('Please login as admin');

    }

    $mycred_balance = array();
    $rate = get_option('evox_earnings_rate_per_coin');
    $users = get_users(array('fields' => array('ID')));
    foreach ($users as $user) {
        $mycred_balance[] = get_user_meta($user->ID, 'mycred_default');
      foreach ($mycred_balance as $user_balance) {
            $amount[] = $user_balance * $rate;

          //  $amount = $rate * intval($mycred_balance);
            $description = 'Wallet credited from tecssapp points';
            $transaction_id = woo_wallet()->wallet->credit($user->ID, $amount, $description);
            if ($transaction_id) {
                echo "<pre>";
                echo __('Amount convert successfully!', 'woo-wallet');
                echo "</pre>";
            } else {
                echo __('An error occurred please try again', 'woo-wallet');
            }


        }
    }
}
}
add_action('init', 'process_coins_earning_to_wallet');