fix: remap add-to-cart→product_id for AJAX, fallback zone detection for guest FSN amount

assets/js/floating-cart.js

@@ -113,7 +113,17 @@
 				e.preventDefault();
 				$btn.addClass( 'loading' ).data( 'cgkit-fc-handled', true );
 
-				$.post( ajaxUrl, $form.serialize() )
+				// WC's wc-ajax=add_to_cart reads $_POST['product_id'], but the
+				// single-product form submits the ID as field name 'add-to-cart'.
+				// Append the correctly-named field so the endpoint finds it.
+				var serialized = $form.serialize();
+				var productId  = $form.find( '[name="add-to-cart"]' ).val() ||
+				                 $form.find( '[name="product_id"]' ).val() || '';
+				if ( productId && serialized.indexOf( 'product_id=' ) === -1 ) {
+					serialized += '&product_id=' + encodeURIComponent( productId );
+				}
+
+				$.post( ajaxUrl, serialized )
 					.done( function ( response ) {
 						if ( ! response ) {
 							self.formFallback( $form, $btn );

cgkit-floating-cart.php

@@ -3,7 +3,7 @@
  * Plugin Name:       CommerceKit Floating Cart
  * Plugin URI:        https://www.commercegurus.com
  * Description:       Adds a floating cart icon (bottom-right) and auto-opens the CommerceKit minicart after add to cart. Requires CommerceGurus CommerceKit and WooCommerce.
- * Version:           1.1.0
+ * Version:           1.1.1
  * Author:            CommerceGurus
  * Author URI:        https://www.commercegurus.com
  * License:           GPLv3
@@ -19,7 +19,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 	exit;
 }
 
-define( 'CGKIT_FC_VERSION', '1.1.0' );
+define( 'CGKIT_FC_VERSION', '1.1.1' );
 define( 'CGKIT_FC_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
 define( 'CGKIT_FC_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 
@@ -56,6 +56,61 @@ add_filter( 'option_commercekit', function ( $options ) {
 	return $options;
 }, 1 );
 
+/**
+ * Fallback free-shipping amount for guests / users without a shipping address.
+ *
+ * CommerceKit bails with `if (!$free_amount) return ''` BEFORE it reaches the
+ * `fsn_before_ship` check. The bail happens because for guests WooCommerce zone
+ * detection falls back to "Rest of World" (empty destination in session), which
+ * often has no free_shipping method → amount stays 0.
+ *
+ * Fix: if the amount is still 0 after CommerceKit's own lookup, redo the zone
+ * detection using the shop's base country/state so we always resolve against
+ * the same zone as a logged-in customer in the store's home country.
+ */
+add_filter( 'commercekit_fsn_get_cart_options', function ( array $options ): array {
+	// Amount already resolved — nothing to do.
+	if ( $options['amount'] > 0 ) {
+		return $options;
+	}
+
+	// Re-run zone detection with the store base location.
+	$fake_package = [
+		'destination' => [
+			'country'  => WC()->countries->get_base_country(),
+			'state'    => WC()->countries->get_base_state(),
+			'postcode' => '',
+			'city'     => '',
+		],
+	];
+
+	$zone      = wc_get_shipping_zone( $fake_package );
+	$th_sep    = wc_get_price_thousand_separator();
+	$dc_sep    = wc_get_price_decimal_separator();
+
+	foreach ( $zone->get_shipping_methods( true ) as $method ) {
+		if ( 'free_shipping' !== $method->id ) {
+			continue;
+		}
+
+		$instance = $method->instance_settings ?? [];
+		$amount   = isset( $instance['min_amount'] ) ? $instance['min_amount'] : 0;
+		$requires = isset( $instance['requires'] ) ? $instance['requires'] : '';
+		$amount   = floatval( str_replace( $dc_sep, '.', str_replace( $th_sep, '', $amount ) ) );
+
+		// Only use this fallback when the method just needs a minimum order
+		// amount — coupon-gated thresholds can't be shown without a coupon.
+		if ( $amount > 0 && 'min_amount' === $requires ) {
+			$options['amount']   = $amount;
+			$options['requires'] = $requires;
+			$options['shipping'] = true;
+		}
+		break;
+	}
+
+	return $options;
+}, 10 );
+
 /**
  * Main plugin class.
  */