The problem was that I had in the “header.php” two different links towards the library “jquery”.
<script src=”https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js”></script>
and
<script src=”http://code.jquery.com/jquery-1.11.1.min.js”></script>
I deleted the second one and now the plugin works correctly. It seems there was a conflict between them.
Thank you!
Thank you! but,
I have made the configuration, but the button still appears and allows to make the reservation without having selected the payment option with Paypal.

