Сергей

.modal-all, .modal-all:before, .modal-all:after,
.modal-all *, .modal-all *:before, .modal-all *:after {
  box-sizing: border-box;
  transition: 0.4s;
}

echo date('Y-m-d H:i:s', $time + (365 * 24 * 3600));

$date = (new DateTimeImmutable())->setTimestamp(1570390622);
$datePlusYear = $date->add(new DateInterval('P1Y'));
echo $date->format('Y-m-d (U)'), ' + 1 year = ', $datePlusYear->format('Y-m-d (U)');

$payment->getConfirmation()->getConfirmationUrl(); //Это и будет ваша ссылка

<button class="site-btn sb-gradients bth-top-margin order-btn" data-price="77605">Оформить заказ</button>
...
<inpu type="hidden" class="modal_price" name="phone">

$(". order-btn").on('click',function(e){
  $('.modal_price').val( $(this).data('price') );
});

width: '100%',
maxWidth: 900

http://www.example.com/script.php?auth=1&password=1&login=1

Returns FALSE on failure