The ‘review order’ page loads the payment methods/totals via ajax – this display a loading spinner briefly. If there are problems, this section may fail to load or the spinner may remain.
First you should check WooCommerce > System Status for errors – often errors will be highlighted.
Still having problems? Common causes and resolutions are listed below.
AJAX error due to WordPress settings.
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Other JavaScript errors and conflicts
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Invalid Response from an AJAX Call
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This can be resolved by either removing the index.html file or by adjusting the indexes directive on the server configuration and prioritizing index.php over index.html. Some caching plugins will also prepend HTML to the JSON response.
You may also see a response of -1, This is a security failure and is caused by a cached nonce.
You can also check for conflicts by turning off other plugins and switching to the default WordPress theme – this will often reveal the problem.
Transactional Emails causing trouble
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add_filter( 'woocommerce_defer_transactional_emails', '__return_true' );
You need to add this code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Please don’t add custom code directly to your parent theme’s functions.php file as this will be wiped entirely when you update the theme.