diff --git a/includes/class-tmdo-wc-orders-interceptor.php b/includes/class-tmdo-wc-orders-interceptor.php
index 0652f19..cda335b 100644
--- a/includes/class-tmdo-wc-orders-interceptor.php
+++ b/includes/class-tmdo-wc-orders-interceptor.php
@@ -6,8 +6,9 @@
  * `wp_wpdo_wc_commissions` table. HPOS-aware (uses `wc_get_order()`).
  *
  * Trigger: `woocommerce_order_status_changed` → on `processing`/`completed`
- *          read order's vendor meta (`_hp_vendor`, `_hp_commission`, etc.)
- *          and INSERT/UPDATE `wp_wpdo_wc_commissions`.
+ *          read hivepress-marketplace's order meta (`hp_vendor`,
+ *          `hp_commission_rate`, `hp_commission_fee`) and INSERT/UPDATE
+ *          `wp_wpdo_wc_commissions`.
  *
  * Reads from order via `wc_get_order()` — works for both HPOS and legacy.
  *
@@ -76,7 +77,7 @@ class TMDO_WC_Orders_Interceptor extends TMDO_Interceptor_Base {
 	/**
 	 * INSERT/UPDATE wp_wpdo_wc_commissions for the given order.
 	 *
-	 * Skips orders without a `_hp_vendor` meta — only marketplace orders count.
+	 * Skips orders without an `hp_vendor` meta — only marketplace orders count.
 	 *
 	 * @param int    $wc_order_id WooCommerce order ID.
 	 * @param string $status      Order status.
@@ -91,18 +92,30 @@ class TMDO_WC_Orders_Interceptor extends TMDO_Interceptor_Base {
 			return;
 		}
 
-		$vendor_id = (int) $order->get_meta( '_hp_vendor' );
-		if ( $vendor_id <= 0 ) {
+		$vendor_post_id = (int) $order->get_meta( 'hp_vendor' );
+		if ( $vendor_post_id <= 0 ) {
 			// Not a marketplace order — skip.
 			return;
 		}
 
-		$listing_id      = (int) $order->get_meta( '_hp_listing' );
-		$subtotal        = (float) ( $order->get_meta( '_hp_subtotal' ) ?: 0 );
-		$commission      = (float) ( $order->get_meta( '_hp_commission' ) ?: 0 );
-		$vendor_payout   = (float) ( $order->get_meta( '_hp_vendor_payout' ) ?: 0 );
-		$commission_rate = (float) ( $order->get_meta( '_hp_commission_rate' ) ?: 0 );
-		$hpos_enabled    = class_exists( 'TMDO_WooCommerce' ) && TMDO_WooCommerce::is_hpos_enabled() ? 1 : 0;
+		// hivepress-marketplace stores the vendor's share (0.9 for a 10% commission) and
+		// a flat fee, and pays vendors net_total * share - fee (Marketplace::get_order_profit()).
+		$vendor_share = (float) $order->get_meta( 'hp_commission_rate' );
+		$fee          = (float) $order->get_meta( 'hp_commission_fee' );
+		$subtotal     = (float) $order->get_total() - (float) $order->get_total_refunded();
+		if ( ! get_option( 'hp_vendor_include_taxes' ) ) {
+			$subtotal -= (float) $order->get_total_tax();
+		}
+		$vendor_payout   = max( 0.0, $subtotal * $vendor_share - $fee );
+		$commission      = $subtotal - $vendor_payout;
+		$commission_rate = round( ( 1 - $vendor_share ) * 100, 2 ); // Platform percentage, as set in Marketplace.
+
+		// vendor_id holds the vendor's user ID (the admin screen resolves it with get_userdata());
+		// the listing is the product's parent, as in Marketplace::get_product_listing().
+		$vendor_id    = (int) get_post_field( 'post_author', $vendor_post_id );
+		$item         = current( $order->get_items() );
+		$listing_id   = $item ? (int) get_post_field( 'post_parent', $item->get_product_id() ) : 0;
+		$hpos_enabled = class_exists( 'TMDO_WooCommerce' ) && TMDO_WooCommerce::is_hpos_enabled() ? 1 : 0;
 
 		$table = TMDO_DB::table( 'wpdo_wc_commissions' );
 		$now   = TMDO_DB::now();
diff --git a/tests/integration/WCOrdersInterceptorTest.php b/tests/integration/WCOrdersInterceptorTest.php
new file mode 100644
index 0000000..09230ea
--- /dev/null
+++ b/tests/integration/WCOrdersInterceptorTest.php
@@ -0,0 +1,160 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+// ── Minimal WooCommerce stand-ins: only what the interceptor calls ─────────
+
+if ( ! class_exists( 'TMDO_Test_WC_Order_Item' ) ) {
+	final class TMDO_Test_WC_Order_Item {
+		public function __construct( private int $product_id ) {}
+
+		public function get_product_id(): int {
+			return $this->product_id;
+		}
+	}
+}
+
+if ( ! class_exists( 'TMDO_Test_WC_Order' ) ) {
+	final class TMDO_Test_WC_Order {
+		/**
+		 * @param array<string, mixed> $meta
+		 */
+		public function __construct(
+			private array $meta,
+			private float $total,
+			private float $tax,
+			private float $refunded,
+			private int $product_id
+		) {}
+
+		public function get_meta( string $key ) {
+			return $this->meta[ $key ] ?? '';
+		}
+
+		public function get_total(): float {
+			return $this->total;
+		}
+
+		public function get_total_tax(): float {
+			return $this->tax;
+		}
+
+		public function get_total_refunded(): float {
+			return $this->refunded;
+		}
+
+		public function get_items(): array {
+			return array( new TMDO_Test_WC_Order_Item( $this->product_id ) );
+		}
+	}
+}
+
+if ( ! function_exists( 'wc_get_order' ) ) {
+	function wc_get_order( $order_id ) {
+		return $GLOBALS['_tmdo_test_orders'][ (int) $order_id ] ?? false;
+	}
+}
+
+if ( ! function_exists( 'get_post_field' ) ) {
+	function get_post_field( string $field, $post ) {
+		return $GLOBALS['_tmdo_test_post_fields'][ (int) $post ][ $field ] ?? '';
+	}
+}
+
+/**
+ * Integration test: commission rows follow hivepress-marketplace's real order meta.
+ *
+ * Marketplace writes `hp_vendor` (vendor post ID), `hp_commission_rate` (vendor
+ * share, e.g. 0.9 for a 10% commission) and `hp_commission_fee` (flat fee), and
+ * pays vendors net_total * rate - fee (HivePress\Components\Marketplace::get_order_profit()).
+ */
+class WCOrdersInterceptorTest extends TestCase {
+
+	private const ORDER_ID    = 9001;
+	private const VENDOR_POST = 7;
+	private const VENDOR_USER = 42;
+	private const PRODUCT_ID  = 900;
+	private const LISTING_ID  = 555;
+
+	public static function setUpBeforeClass(): void {
+		TMDO_Installer::install_v2_tables();
+	}
+
+	protected function setUp(): void {
+		global $wpdb;
+		$wpdb->prefix  = 'wp_itest_';
+		$wpdb->options = 'wp_itest_options';
+		$wpdb->query( 'DELETE FROM `wp_itest_wpdo_wc_commissions` WHERE wc_order_id = ' . self::ORDER_ID );
+
+		delete_option( 'hp_vendor_include_taxes' );
+		TMDO_Feature_Flags::set( 'wc_orders', 'dual_write' );
+
+		$GLOBALS['_tmdo_test_post_fields'] = array(
+			self::VENDOR_POST => array( 'post_author' => self::VENDOR_USER ),
+			self::PRODUCT_ID  => array( 'post_parent' => self::LISTING_ID ),
+		);
+	}
+
+	protected function tearDown(): void {
+		TMDO_Feature_Flags::set( 'wc_orders', 'idle' );
+		unset( $GLOBALS['_tmdo_test_orders'], $GLOBALS['_tmdo_test_post_fields'] );
+	}
+
+	private function place_order( array $meta, float $total, float $tax = 0.0, float $refunded = 0.0 ): void {
+		$GLOBALS['_tmdo_test_orders'][ self::ORDER_ID ] = new TMDO_Test_WC_Order( $meta, $total, $tax, $refunded, self::PRODUCT_ID );
+		( new TMDO_WC_Orders_Interceptor() )->action_order_status_changed( self::ORDER_ID, 'pending', 'processing' );
+	}
+
+	private function commission_row(): ?array {
+		global $wpdb;
+		return $wpdb->get_row( 'SELECT * FROM `wp_itest_wpdo_wc_commissions` WHERE wc_order_id = ' . self::ORDER_ID, ARRAY_A );
+	}
+
+	private function marketplace_meta(): array {
+		return array(
+			'hp_vendor'          => self::VENDOR_POST,
+			'hp_commission_rate' => 0.9,
+			'hp_commission_fee'  => 5,
+		);
+	}
+
+	public function test_records_commission_from_marketplace_meta(): void {
+		$this->place_order( $this->marketplace_meta(), 110.0, 10.0 );
+
+		$row = $this->commission_row();
+
+		$this->assertNotNull( $row );
+		$this->assertSame( self::VENDOR_USER, (int) $row['vendor_id'] );
+		$this->assertSame( self::LISTING_ID, (int) $row['listing_id'] );
+		$this->assertEqualsWithDelta( 100.0, (float) $row['subtotal'], 0.0001 );
+		$this->assertEqualsWithDelta( 85.0, (float) $row['vendor_payout'], 0.0001 );
+		$this->assertEqualsWithDelta( 15.0, (float) $row['commission'], 0.0001 );
+		$this->assertEqualsWithDelta( 10.0, (float) $row['commission_rate'], 0.0001 );
+	}
+
+	public function test_includes_taxes_when_marketplace_setting_is_on(): void {
+		update_option( 'hp_vendor_include_taxes', '1' );
+
+		$this->place_order( $this->marketplace_meta(), 110.0, 10.0 );
+
+		$row = $this->commission_row();
+		$this->assertEqualsWithDelta( 110.0, (float) $row['subtotal'], 0.0001 );
+		$this->assertEqualsWithDelta( 94.0, (float) $row['vendor_payout'], 0.0001 );
+		$this->assertEqualsWithDelta( 16.0, (float) $row['commission'], 0.0001 );
+	}
+
+	public function test_skips_orders_without_marketplace_vendor(): void {
+		$this->place_order( array(), 110.0 );
+
+		$this->assertNull( $this->commission_row() );
+	}
+
+	public function test_vendor_payout_never_goes_negative(): void {
+		$this->place_order( $this->marketplace_meta(), 3.0 );
+
+		$row = $this->commission_row();
+		$this->assertEqualsWithDelta( 0.0, (float) $row['vendor_payout'], 0.0001 );
+		$this->assertEqualsWithDelta( 3.0, (float) $row['commission'], 0.0001 );
+	}
+}