diff --git a/.changeset/pay-webhook-livemode.md b/.changeset/pay-webhook-livemode.md
new file mode 100644
index 0000000..8aa9d37
--- /dev/null
+++ b/.changeset/pay-webhook-livemode.md
@@ -0,0 +1,8 @@
+---
+"@agentaos/pay": minor
+---
+
+Add `livemode` to webhook payloads and type the subscription webhook events.
+
+- Every `WebhookEvent` `data` now carries `livemode: boolean` (`true` = live mode, `false` = test mode) — the account-mode signal. This replaces the previous chain-specific `testnet` field, which was meaningless for card/bank rails; use `network` for the chain/rail.
+- New `SubscriptionData` type and five `subscription.*` events on the `WebhookEvent` union: `subscription.created`, `subscription.renewed`, `subscription.payment_failed`, `subscription.updated`, `subscription.canceled`.
diff --git a/packages/pay/src/index.ts b/packages/pay/src/index.ts
index 4ccc161..b500148 100644
--- a/packages/pay/src/index.ts
+++ b/packages/pay/src/index.ts
@@ -23,6 +23,7 @@ export type {
 	CheckoutCompletedData,
 	SendCompletedData,
 	SendFailedData,
+	SubscriptionData,
 	PaginatedList,
 	ListParams,
 } from './types.js';
diff --git a/packages/pay/src/types.ts b/packages/pay/src/types.ts
index 3173a10..418affa 100644
--- a/packages/pay/src/types.ts
+++ b/packages/pay/src/types.ts
@@ -365,6 +365,8 @@ export interface CheckoutCompletedData {
 	payer: string;
 	payerType: 'human' | 'agent';
 	network: string;
+	/** `true` = live mode, `false` = test mode. Account mode, not the chain — see `network` for the chain/rail. */
+	livemode: boolean;
 	metadata: Record<string, unknown>;
 }
 
@@ -377,6 +379,8 @@ export interface SendCompletedData {
 	token: string;
 	chainId: number;
 	network: string;
+	/** `true` = live mode, `false` = test mode. */
+	livemode: boolean;
 	description: string | null;
 }
 
@@ -389,10 +393,34 @@ export interface SendFailedData {
 	token: string;
 	chainId: number;
 	network: string;
+	/** `true` = live mode, `false` = test mode. */
+	livemode: boolean;
 	description: string | null;
 }
 
+export interface SubscriptionData {
+	id: string;
+	/** Stripe subscription status, mirrored verbatim (e.g. `incomplete`, `active`, `trialing`, `past_due`, `unpaid`, `canceled`). */
+	status: string;
+	planName: string | null;
+	currency: string;
+	/** Price snapshot in integer minor units (e.g. cents). */
+	amountMinor: number;
+	/** ISO 8601 timestamp, or `null` before the first billing cycle is set. */
+	currentPeriodEnd: string | null;
+	cancelAtPeriodEnd: boolean;
+	customerEmail: string | null;
+	customerName: string | null;
+	/** `true` = live mode, `false` = test mode. */
+	livemode: boolean;
+}
+
 export type WebhookEvent =
 	| { type: 'checkout.session.completed'; data: CheckoutCompletedData }
 	| { type: 'send.completed'; data: SendCompletedData }
-	| { type: 'send.failed'; data: SendFailedData };
+	| { type: 'send.failed'; data: SendFailedData }
+	| { type: 'subscription.created'; data: SubscriptionData }
+	| { type: 'subscription.renewed'; data: SubscriptionData }
+	| { type: 'subscription.payment_failed'; data: SubscriptionData }
+	| { type: 'subscription.updated'; data: SubscriptionData }
+	| { type: 'subscription.canceled'; data: SubscriptionData };