URGENT – Conflict with WooCommerce 2.4.10

And here are lines 241-293 of of checkout.js:

wc_checkout_form.xhr = $.ajax({
	type:		'POST',
	url:		wc_checkout_params.wc_ajax_url.toString().replace( '%%endpoint%%', 'update_order_review' ),
	data:		data,
	success:	function( data ) {
		// Always update the fragments
		if ( data && data.fragments ) {
			$.each( data.fragments, function ( key, value ) {
				$( key ).replaceWith( value );
				$( key ).unblock();
			} );
		}

		// Check for error
		if ( 'failure' === data.result ) {

			var $form = $( 'form.checkout' );

			if ( 'true' === data.reload ) {
				window.location.reload();
				return;
			}

			$( '.woocommerce-error, .woocommerce-message' ).remove();

			// Add new errors
			if ( data.messages ) {
				$form.prepend( data.messages );
			} else {
				$form.prepend( data );
			}

			// Lose focus for all fields
			$form.find( '.input-text, select' ).blur();

			// Scroll to top
			$( 'html, body' ).animate( {
				scrollTop: ( $( 'form.checkout' ).offset().top - 100 )
			}, 1000 );

		}

		// Trigger click e on selected payment method
		if ( $( '.woocommerce-checkout' ).find( 'input[name=payment_method]:checked' ).size() === 0 ) {
			$( '.woocommerce-checkout' ).find( 'input[name=payment_method]:eq(0)' ).attr( 'checked', 'checked' );
		}
		$( '.woocommerce-checkout' ).find( 'input[name=payment_method]:checked' ).eq(0).trigger( 'click' );

		// Fire updated_checkout e
		$( document.body ).trigger( 'updated_checkout' );
	}

});

That still didn’t fix it. I know WooCommerce uses endpoints now instead of dedicated pages for some things… And this AJAX request that’s looking for an endpoint returns a success message but for some reason the code is 404 instead of 200. I’m wondering if it has something to do with permalinks/rewriting and the way CPT UI works with them?