enrol.html

<div align="center">

<p><?php print_string("paymentrequired") ?></p>
<p><b><?php echo $instancename; ?></b></p>
<p><b><?php echo get_string("cost").": {$instance->currency} {$localisedcost}"; ?></b></p>
<p><img alt="<?php print_string('accepted', 'enrol_mercadopago') ?>" src="<?php echo "$CFG->wwwroot/enrol/mercadopago/pix/mercadopago.png"?>" /></p>
<p><?php print_string("paymentinstant") ?></p>

<div class="cho-container">
</div>

<script src="https://sdk.mercadopago.com/js/v2"></script>
<script>
    const mp = new MercadoPago('<?php echo $public_key; ?>');
    mp.checkout({
        preference: {
            id: '<?php echo $preference->id; ?>'
        },
        render: {
            container: '.cho-container',
            label: 'Pagar',
        }
    });
</script>

</div>