diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 90ab75f..9ee1268 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   ci:
-    uses: AntelopeJS/.github/.github/workflows/ci-node.yml@v1
+    uses: AntelopeJS/.github/.github/workflows/ci-node.yml@v1-campaign
     with:
       docs-files: |
         README.md
diff --git a/README.md b/README.md
index 5521ab4..84dd034 100644
--- a/README.md
+++ b/README.md
@@ -139,14 +139,19 @@ off-session before `CreateSubscription` resolves. Adapt those amounts to your
 billing policy. Register an idempotent handler for subsequent lifecycle events:
 
 ```ts
-import { SubscriptionEvents } from "@antelopejs/interface-subscriptions";
+import {
+  SubscriptionEvents,
+  type Subscription,
+} from "@antelopejs/interface-subscriptions";
+
+declare function grantOrRevokeAccess(subscription: Subscription): Promise<void>;
 
 SubscriptionEvents.register("billing", async (event) => {
   await grantOrRevokeAccess(event.subscription);
 });
 ```
 
-`grantOrRevokeAccess` stands for your application's access policy. Deduplicate
+`grantOrRevokeAccess` stands for your application's access policy, and its `declare` line only gives it a type. Deduplicate
 events by `event.id` as described in [Events](./docs/3.events.md).
 
 ## Compatibility
@@ -162,7 +167,7 @@ events by `event.id` as described in [Events](./docs/3.events.md).
 
 These are the peer requirements in `package.json`. Development uses the same
 payment-interface semver range. Check your implementing module's requirements
-too. `@antelopejs/core` 1.16.0 is a development test runner, not a runtime peer.
+too. `@antelopejs/core` is a development test runner, not a runtime peer.
 
 ## Conventions
 
diff --git a/docs/2.subscriptions.md b/docs/2.subscriptions.md
index 723beb8..7eb0154 100644
--- a/docs/2.subscriptions.md
+++ b/docs/2.subscriptions.md
@@ -20,17 +20,26 @@ taken from a payer who is there. That first payment is an ordinary one-off; the
 subscription starts after it, and its first period is a separate charge.
 
 ```ts
-const subscription = await CreateSubscription(
-  {
-    reference: accountId,
-    customer,
-    paymentMethod: method.id,
-    amount: { value: 1900, currency: "EUR" },
-    interval: "month",
-    intervalCount: 1,
-  },
-  `subscribe-${accountId}`,
-);
+import type { PaymentMethod } from "@antelopejs/interface-payment";
+import { CreateSubscription } from "@antelopejs/interface-subscriptions";
+
+export async function subscribe(
+  accountId: string,
+  customer: string,
+  method: PaymentMethod,
+) {
+  return await CreateSubscription(
+    {
+      reference: accountId,
+      customer,
+      paymentMethod: method.id,
+      amount: { value: 1900, currency: "EUR" },
+      interval: "month",
+      intervalCount: 1,
+    },
+    `subscribe-${accountId}`,
+  );
+}
 ```
 
 Without a trial or a billing anchor, the first period is charged off-session
@@ -102,11 +111,22 @@ If the saved method will not work again — an expired card — take a new manda
 on-session and switch to it:
 
 ```ts
-await UpdateSubscriptionPaymentMethod(
-  subscription.id,
-  newMethodId,
-  idempotencyKey,
-);
+import {
+  UpdateSubscriptionPaymentMethod,
+  type Subscription,
+} from "@antelopejs/interface-subscriptions";
+
+export async function switchMethod(
+  subscription: Subscription,
+  newMethodId: string,
+  idempotencyKey: string,
+) {
+  await UpdateSubscriptionPaymentMethod(
+    subscription.id,
+    newMethodId,
+    idempotencyKey,
+  );
+}
 ```
 
 Nothing is charged by the switch. The next scheduled attempt uses the new method.
@@ -114,8 +134,12 @@ Nothing is charged by the switch. The next scheduled attempt uses the new method
 ## Cancelling
 
 ```ts
-await CancelSubscription(id, `cancel-period-end-${id}`, "period_end"); // run out the paid period
-await CancelSubscription(id, `cancel-now-${id}`, "now"); // end immediately
+import { CancelSubscription } from "@antelopejs/interface-subscriptions";
+
+export async function cancel(id: string) {
+  await CancelSubscription(id, `cancel-period-end-${id}`, "period_end"); // run out the paid period
+  await CancelSubscription(id, `cancel-now-${id}`, "now"); // end immediately
+}
 ```
 
 Use distinct keys for distinct operations. Reuse a key only when retrying the
diff --git a/docs/3.events.md b/docs/3.events.md
index f046c4c..95d4a6c 100644
--- a/docs/3.events.md
+++ b/docs/3.events.md
@@ -24,7 +24,13 @@ event: the caller made those changes and already knows.
 ## Receiving them
 
 ```ts
-import { SubscriptionEvents } from "@antelopejs/interface-subscriptions";
+import {
+  SubscriptionEvents,
+  type SubscriptionEvent,
+} from "@antelopejs/interface-subscriptions";
+
+declare function alreadyHandled(eventId: string): Promise<boolean>;
+declare function applyToAccount(event: SubscriptionEvent): Promise<void>;
 
 SubscriptionEvents.register("billing", async (event) => {
   if (await alreadyHandled(event.id)) return;
@@ -68,9 +74,17 @@ Every subscription charge is an ordinary payment-interface payment, so its
 the subscription's identifier:
 
 ```ts
-const event = await VerifyWebhook(request);
-if (event?.payment?.metadata?.[SUBSCRIPTION_METADATA_KEY]) {
-  return; // a subscription charge: handled by the subscription event
+import {
+  VerifyWebhook,
+  type WebhookRequest,
+} from "@antelopejs/interface-payment";
+import { SUBSCRIPTION_METADATA_KEY } from "@antelopejs/interface-subscriptions";
+
+export async function handlePaymentWebhook(request: WebhookRequest) {
+  const event = await VerifyWebhook(request);
+  if (event?.payment?.metadata?.[SUBSCRIPTION_METADATA_KEY]) {
+    return; // a subscription charge: handled by the subscription event
+  }
 }
 ```
 
diff --git a/docs/4.implementing.md b/docs/4.implementing.md
index afa2d44..bfb45a7 100644
--- a/docs/4.implementing.md
+++ b/docs/4.implementing.md
@@ -61,7 +61,7 @@ own: that would put a mandatory database and scheduler into a payment module.
 The calls are declared directly as the public names, so the whole module is the
 declaration:
 
-```ts
+```ts fragment
 import * as subscriptions from "@antelopejs/interface-subscriptions";
 import { ImplementInterface } from "@antelopejs/interface-core";
 
diff --git a/docs/tsconfig.json b/docs/tsconfig.json
index c3e8775..fff0882 100644
--- a/docs/tsconfig.json
+++ b/docs/tsconfig.json
@@ -1,6 +1,8 @@
 {
   "extends": "../tsconfig.json",
   "compilerOptions": {
+    "module": "esnext",
+    "moduleResolution": "bundler",
     "noEmit": true,
     "composite": false,
     "incremental": false,