You are helping me build the following AI agent workflow.

## Goal
Subscription Renewal Reminder Automation: Tracks subscription expiry dates via webhook, creates ClickUp tasks, and sends scheduled reminder emails before renewal.

## Specification
- What it does: You stay on top of subscription renewals without manual tracking by letting this automation listen for expiry dates via webhook. It instantly creates ClickUp tasks for you and sends timely reminder emails before each renewal due date. You also get automatic status updates as the system checks for upcoming renewals to keep your workflow current.
- Trigger: Triggered by an event (Event · on new subscription data via webhook)
- Autonomy: Fully hands-off
- Expected setup effort: under an hour
- Tools/services involved:
  - n8n: Workflow orchestration platform
  - ClickUp: Creating and tracking renewal tasks
  - Send Email: Dispatching reminder emails to customers
  - Code: Calculating dates and dynamic content logic

## Known pitfalls, handle each one explicitly in your implementation
1. Timezone mismatches can cause reminders to fire at wrong local times so always convert timestamps to UTC before processing.
2. Webhook payloads may lack required fields if the source system changes structure so validate input data early in the workflow.

## Reference implementation
https://n8n.io/workflows/13259 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/subscription-renewal-reminder-automation/ via usecasesforagents.com