[CLEAN] Synthetic Benchmark PR #24889 - feat: queue or cancel payment reminder flow

[bar-qodo]

Benchmark PR calcom#24889

Type: Clean (correct implementation)

Original PR Title: feat: queue or cancel payment reminder flow
Original PR Description: ## What does this PR do?

• Fixes [CAL-2815] "Complete Your Booking" Payment Prompt Is Still Sent When Payment Has Been Received Via Collect Payment On Booking calcom/cal.com#11272
• Fixes CAL-2815

Visual Demo (For contributors especially)

Screen.Recording.2025-11-07.at.3.16.49.PM.mov

---

Summary by cubic

Queues an awaiting payment reminder for unpaid bookings and cancels it if payment succeeds, giving users time to pay without a premature email. Addresses CAL-2815 with seat-aware reminders and improved success handling after Stripe redirects.

• New Features
  • Configurable delay before sending (default 15 minutes via AWAITING_PAYMENT_EMAIL_DELAY_MINUTES).
  • Scheduled via background task; canceled on payment success and skipped if the Stripe intent already succeeded.
  • Seat-specific targeting for seated events; payment link prefilled with attendee info.
  • Success page hides the awaiting payment state when redirect_status=succeeded.

^{Written for commit 67f1bd5. Summary will update on new commits.}

Original PR URL: calcom#24889

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