<form action="https://pagseguro.uol.com.br/v2/checkout/payment.html" method="post" >

    <input type="hidden" name="receiverEmail" value="SEU EMAIL">

        <input type="hidden" name="currency" value="BRL">

        <input type="hidden" name="itemId1" value="0001">

        <input type="hidden" name="itemDescription1" value="SuaLoja-<?php echo $auth['player']; ?>">

        <input type="hidden" name="itemAmount1" value="20.00">

        <input type="hidden" name="itemQuantity1" value="1">

        <input type="hidden" name="itemWeight1" value="1000">

        <input type="hidden" name="reference" value="SuaLoja-<?php echo $auth['player']; ?>">

    <button type="submit" name="submit" id="submit" data-toggle="tooltip" data-placement="bottom" title="" data-original-title="Comprar com pagseguro" class="btn btn-lg btn-block btn-primary">Comprar agora</button>

</form>