diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf72294..758b1cf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,6 +40,7 @@ jobs:
           python-version: '3.12'
       - run: >-
           uv run --isolated --no-project --default-index https://pypi.org/simple
-          --with 'vatly-api-python==0.1.0a2' --with 'pytest>=8,<10'
+          --refresh-package vatly-api-python
+          --with 'vatly-api-python==0.1.0a3' --with 'pytest>=8,<10'
           --with 'pytest-asyncio>=1,<2' --with 'pyyaml>=6,<7'
           python -m pytest -q tests/test_docs.py
diff --git a/docs/Orders.md b/docs/Orders.md
index 4db9e67..0ecbac9 100644
--- a/docs/Orders.md
+++ b/docs/Orders.md
@@ -14,22 +14,32 @@ from vatly import VatlyClient
 def example(client: VatlyClient):
     order = client.orders.get("order_example")
     lines = [(line.product_type, line.product_id, line.quantity) for line in order.lines]
+    subscription_ids = [
+        line.related_resources.subscription_id
+        for line in order.lines
+        if line.related_resources is not None
+    ]
     refundable = Decimal(order.refundable_subtotal.root.value)
-    return order.status, lines, refundable
+    return order.status, lines, subscription_ids, refundable
 ```
 
 | Response field | Meaning |
 | --- | --- |
 | `id`, `status`, `customer_id` | Order identity and payment state |
-| `lines` | OrderLine models with `id`, `product_type`, `product_id`, `quantity` |
+| `lines` | OrderLine models with `id`, `product_type`, `product_id`, `quantity`, `related_resources` |
 | `refundable_subtotal`, `reversed_subtotal` | Money wrappers; read `.root.value` and `.root.currency` |
 | `links.customer_invoice` | Optional customer invoice link |
 | `testmode`, `metadata` | Mode and custom data |
 
 `product_type="subscription_plan"` means `product_id` is a plan ID;
 `"subscription"` means a subscription ID. Never substitute one for the other.
-This alpha has no typed related-resources accessor; extra response fields survive
-validation, but application linkage support still needs a package update.
+
+`line.related_resources.subscription_id` is the subscription associated with a
+signup, renewal or immediate-update line. `related_resources` is `None` on
+historical and unrelated lines. On a signup line, `subscription_id` is `None`
+until the subscription is available; read the order again later. An ID alone
+does not prove activation or entitlement: check the subscription's ownership and
+status before granting access.
 
 ## List orders and request an invoice-details link
 
diff --git a/docs/README.md b/docs/README.md
index daac941..7e74763 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -9,7 +9,7 @@ integration, use Fluent Python or Vatly Django.
 ## Install and connect
 
 ```bash
-python -m pip install vatly-api-python==0.1.0a2
+python -m pip install vatly-api-python==0.1.0a3
 ```
 
 Set `VATLY_API_KEY` in your server environment. Test and live keys use the same
@@ -63,4 +63,4 @@ camelCase wire keys. Unknown response fields are preserved.
 
 [API reference](https://docs.vatly.com/api-reference) contains the complete request
 and response contracts. Examples in these guides are executed against published
-`0.1.0a2` packages with local HTTP fixtures; tests make no Vatly account changes.
+`0.1.0a3` packages with local HTTP fixtures; tests make no Vatly account changes.