Duplicate Stripe Payments & Form Submissions

Hello there @melcriddle

Our Second Level Support devs were able to provide a custom snippet that should make the forms avoiding such issues.

<?php
add_action( 'wp_footer', function(){
	?>
	<style>
		.wpmudev-fm-submitting{
			position: relative;
			cursor: wait;
		}
		.wpmudev-fm-submitting:after{
			content: "";
			position: absolute;
			left:0;
			right: 0;
			bottom:0;
			top:0;
		}
	</style>
	<script>
		(function($){
			$(function(){
				let _submit_buttons = $('.forminator-button-submit');
				if( _submit_buttons.length ){
					let _parent_button = null;
					_submit_buttons.on('click', function(){
						_parent_button = $(this).parent();
						_parent_button.addClass('wpmudev-fm-submitting');
						setTimeout(function(){
							if( _parent_button ){
								_parent_button.removeClass('wpmudev-fm-submitting');
								_parent_button = null;
							}
						}, 3000);
					});
					$('body').on('after:forminator:form:submit', function(){
						if( _parent_button ){
							_parent_button.removeClass('wpmudev-fm-submitting');
							_parent_button = null;
						}
					});
				}
			});
		})(window.jQuery)
	</script>
	<?php
}, 21 );

You can add this snippet code into a new MU plugin.
If you are not familiar with mu-plugins you can read about them here:
https://premium.wpmudev.org/docs/using-wordpress/installing-wordpress-plugins/#installing-mu-plugins

Warm regards,
Dimitris