If you are using some kind of optimization feature there are files that needs to be excluded from any caching or concatenating.

For Avarda Checkout for WooCommerce you need to exclude the following files:

• wp-content/plugins/avarda-checkout-for-woocommerce/assets/js/aco_checkout.js
• wp-content/plugins/avarda-checkout-for-woocommerce/assets/js/aco_shipping_widget.js
• wp-content/plugins/avarda-checkout-for-woocommerce/assets/js/aco_utility.js
• wp-content/plugins/avarda-checkout-for-woocommerce/assets/css/aco_style.css

• wp-content/plugins/avarda-checkout-for-woocommerce/dependencies/krokedil/shipping/src//assets/css/pickup-point-select.css
• wp-content/plugins/avarda-checkout-for-woocommerce/dependencies/krokedil/shipping/src//assets/css/pickup-point-select.js

• stage.checkout-cdn.avarda.com
• checkout-cdn.avarda.com
• cdn.avarda.com

• Files from https://checkout-api.avarda.com
• Files from https://stage.checkout-api.avarda.com