document billing activity tiles and payment grace

platform/support/pricing.mdx

@@ -40,7 +40,7 @@ Teams requires at least **2 seats**. At the introductory annual rate, that is \$
 
 ### Free trial
 
-Pro and Teams include a **14-day free trial** the first time your workspace subscribes. Start it at [signup](https://app.graphify.com/signup). When the trial ends, the plan renews as a paid subscription unless you cancel before then; a cancelled trial returns the workspace to Free. Upgrading an existing Pro subscription to Teams doesn't start a new trial.
+Pro and Teams include a **14-day free trial** the first time your workspace subscribes. Each workspace gets one trial. Start it at [signup](https://app.graphify.com/signup) or from **Billing** (a card is required for the trial). When the trial ends, the plan renews as a paid subscription unless you cancel before then; a cancelled trial returns the workspace to Free. Upgrading an existing Pro subscription to Teams doesn't start a new trial.
 
 The Free plan stays free with no card, within the allowances below.
 
@@ -139,9 +139,24 @@ Both **Teams** and **Enterprise** include a **dedicated Slack support channel**.
 
 ## Billing and subscription management
 
-Open **Billing** in your [Graphify workspace](https://app.graphify.com) to review the current plan, seats, billing interval, and renewal information. Use its billing portal for payment details, invoices, and cancellation. Billing actions depend on your workspace permissions.
+Open **Billing** in your [Graphify workspace](https://app.graphify.com) to review the current plan, seats, billing interval, and renewal information. Use its billing portal for payment details, invoices, and cancellation. Only workspace **owners** and **billing** members can open the portal.
 
-Paid subscriptions renew until cancelled. Under the standard [Terms of Service](https://graphify.com/terms), cancellation takes effect at the end of the current billing period, and paid fees are non-refundable except where required by law. Review the confirmation shown when changing a plan or seat count. Enterprise invoicing and changes follow the agreement with your account team.
+### Your agent's activity on Billing
+
+**Billing** shows two tiles about your agent:
+
+- **Calls.** How many times your agent called Graphify over the last 7 days, across all your workspaces.
+- **Context tokens.** How your agent's Graphify answers in this workspace compared with reading the same source files, over the last 30 days.
+
+Expand **How it's measured** for the method. **View activity** opens the detail. When there are no calls yet, the link says **Connect your agent** instead.
+
+### Failed payment
+
+If a paid payment fails, the workspace stays open during a grace period. A banner explains what to do and, when the backend has a deadline, when to update the card. Owners and billing members can update payment; everyone else is asked to check with an owner.
+
+### Cancel a paid plan
+
+Paid subscriptions renew until cancelled. Under the standard [Terms of Service](https://graphify.com/terms), cancellation takes effect at the end of the current billing period, and paid fees are non-refundable except where required by law. After that, the workspace stays usable on the Free plan (within Free allowances). Review the confirmation shown when changing a plan or seat count. Enterprise invoicing and changes follow the agreement with your account team.
 
 ## Open-source and startup programs