<tr>
<td>{@code orderId}</td>
<td>A unique order identifier for the transaction. This identifier
- corresponds to the Google payments order ID.</td>
+ corresponds to the Google payments order ID. If the order is a test
+ purchase made through the In-app Billing Sandbox, {@code orderId} is
+ blank.</td>
</tr>
<tr>
<td>{@code packageName}</td>
<p>Once authorized for testing access, those users can make purchases without
being charged.
Test purchases are real orders and Google Play processes them in the same way as
-other orders. When purchases are complete, Google Play prevents the orders from
+other orders. However, the <code>orderId</code> field for test purchases is
+blank.
+When purchases are complete, Google Play prevents the orders from
going to financial processing, ensuring that there are no actual charges to user
-accounts, and automatically canceling the completed orders after 14 days. </p>
+accounts, and automatically canceling the completed orders after 14 days.</p>
<p class="note">
<strong>Note:</strong> Test subscription purchases recur daily, regardless of