subscription-plan-changes

# Subscription Plan Changes ## Stripe MCP Setup Requires **Stripe MCP** connected via OAuth or restricted key. Docs: https://docs.stripe.com/mcp 1. `GetMcpTools` with `server: "user-Stripe"` (or `plugin-stripe-stripe`) before any call 2. Prefer `stripe_api_search` → `stripe_api_details` → `stripe_api_read` for list/retrieve 3. **Always paginate** — `limit: 100`, follow `has_more` with `starting_after` 4. Amounts are in **cents** unless noted 5. Never expose secret keys in output ## Workflow 1. Review codebase checkout update path (`subscriptions.update` vs new checkout) 2. Sample recent `customer.subscription.updated` — compare `items` price changes 3. Check proration: `proration_behavior`, invoice line items for `proration` ## Anti-Patterns - Creating **new** subscription instead of updating → double billing - No `alreadyOnPlan` guard ## Output Template ``` Plan Change Audit Update method: in-place / new checkout Proration: [behavior] Recent migrations (sample): | Customer | From → To | Proration $ | Recommendations: ... ```