Fraud Protection: Add event dispatching for pay-for-order page (#35)

* Add tracking for pay-for-order page in CheckoutEventTracker

Enhance the CheckoutEventTracker to collect an event when the pay-for-order page is loaded. This change includes a new conditional check for the pay-for-order page and updates the corresponding unit tests to verify that the event is correctly collected during the checkout process.

Author: leonardola

src/CheckoutEventTracker.php

@@ -61,9 +61,12 @@ public function register(): void {
 	 * @return void
 	 */
 	public function track_checkout_page_loaded(): void {
-		if ( function_exists( 'is_checkout' ) && is_checkout() && ! is_order_received_page() ) {
-			$this->session_data_collector->collect( 'checkout_page_loaded', array() );
+		if ( ! function_exists( 'is_checkout' ) || ! is_checkout() || is_order_received_page() ) {
+			return;
 		}
+
+		$event_name = is_checkout_pay_page() ? 'pay_for_order_page_loaded' : 'checkout_page_loaded';
+		$this->session_data_collector->collect( $event_name, array() );
 	}
 
 	/**

tests/php/src/CheckoutEventTrackerTest.php

@@ -116,6 +116,34 @@ public function test_track_checkout_page_loaded_does_not_collect_when_not_checko
 		$this->sut->track_checkout_page_loaded();
 	}
 
+	/**
+	 * @testdox track_checkout_page_loaded() collects pay_for_order_page_loaded (not checkout_page_loaded) on the pay-for-order page.
+	 */
+	public function test_track_checkout_page_loaded_collects_pay_for_order_event(): void {
+		global $wp;
+		$wp->query_vars['order-pay'] = 123;
+		add_filter( 'woocommerce_is_checkout', '__return_true' );
+
+		$collected_events = array();
+		$this->mock_collector
+			->expects( $this->atLeast( 1 ) )
+			->method( 'collect' )
+			->willReturnCallback(
+				function ( $event_type, $event_data ) use ( &$collected_events ) {
+					$collected_events[] = $event_type;
+					return array();
+				}
+			);
+
+		$this->sut->track_checkout_page_loaded();
+
+		$this->assertContains( 'pay_for_order_page_loaded', $collected_events, 'pay_for_order_page_loaded event should be collected on the pay-for-order page' );
+		$this->assertNotContains( 'checkout_page_loaded', $collected_events, 'checkout_page_loaded event should NOT be collected on the pay-for-order page' );
+
+		remove_filter( 'woocommerce_is_checkout', '__return_true' );
+		unset( $wp->query_vars['order-pay'] );
+	}
+
 	// ========================================
 	// Blocks Checkout Tests
 	// ========================================