add_action('woocommerce_before_checkout_form', 'custom_endpoint_function');
add_action('woocommerce_checkout_before_customer_details', 'custom_endpoint_function');
add_action('woocommerce_before_checkout_billing_form', 'custom_endpoint_function');
add_action('woocommerce_after_checkout_billing_form', 'custom_endpoint_function');
add_action('woocommerce_before_checkout_shipping_form', 'custom_endpoint_function');
add_action('woocommerce_after_checkout_shipping_form', 'custom_endpoint_function');
add_action('woocommerce_before_order_notes', 'custom_endpoint_function');
add_action('woocommerce_after_order_notes', 'custom_endpoint_function');
add_action('woocommerce_checkout_after_customer_details', 'custom_endpoint_function');
add_action('woocommerce_checkout_before_order_review', 'custom_endpoint_function');
add_action('woocommerce_review_order_before_cart_contents', 'custom_endpoint_function');
add_action('woocommerce_review_order_after_cart_contents', 'custom_endpoint_function');
add_action('woocommerce_review_order_before_shipping', 'custom_endpoint_function');
add_action('woocommerce_review_order_after_shipping', 'custom_endpoint_function');
add_action('woocommerce_review_order_before_order_total', 'custom_endpoint_function');
add_action('woocommerce_review_order_after_order_total', 'custom_endpoint_function');
add_action('woocommerce_review_order_before_payment', 'custom_endpoint_function');
add_action('woocommerce_review_order_before_submit', 'custom_endpoint_function');
add_action('woocommerce_review_order_after_submit', 'custom_endpoint_function'
add_action('woocommerce_review_order_after_payment', 'custom_endpoint_function'
add_action('woocommerce_checkout_after_order_review', 'custom_endpoint_function'
add_action('woocommerce_after_checkout_form', 'custom_endpoint_function'
