QA Bug Ticket Standardizer

[BUG] [Checkout / Stripe Payment]: Pay button hangs indefinitely (infinite spinner) when purchasing annual plan with promo code on iOS Safari

Classification & Triage

• Issue Type: Bug

Severity: Critical - Blocks revenue-generating checkout flow on production for a mobile Safari user; no workaround confirmed yet (desktop retry untested).

• Priority: P1
• Component/Module: B2B SaaS Billing Portal / Stripe Checkout integration

Description
A customer attempting to purchase an annual plan with a promo code on an iPhone (Safari) reports that the "Pay" button enters a perpetual loading state and the transaction never completes or returns an error. This indicates a likely unresolved or failed async request during payment confirmation, with no timeout or error handling surfaced to the user. Impact: lost conversions and potential duplicate charges if the user retries. The report only confirms one user and one device, so scope is unknown.

Environment Matrix

• Device / Platform: iPhone (mobile) - [To Verify - e.g., iPhone 14 / 15]
• OS & Version: [To Verify - e.g., iOS 17.4]
• Browser / App Version: Safari - [To Verify - version / in-app browser vs. standalone Safari]
• Environment: Production
• User Account / Role: [To Verify - e.g., new customer vs. existing account, org admin / billing role]

Steps to Reproduce
1.

Preconditions: User is logged into the Billing Portal on an iPhone using Safari; the annual plan and a valid promo code are available. [To Verify - promo code value, type, and validity]
2. Open the Billing Portal and navigate to the plans/pricing page. [Inferred]
3. Select the Annual plan and proceed to Stripe Checkout. [Inferred]
4. Enter the promo code in the promo/discount field and apply it. [Inferred]
5. Enter payment details. [Inferred]
6. Tap the Pay button. Bug triggers here.

Expected Result
After tapping Pay, the payment is processed within a few seconds. The user is redirected to a success/confirmation page with the discounted annual total charged, or shown a clear error message if payment fails.

Actual Result
The Pay button displays a spinner indefinitely. No success confirmation, redirect, or error message appears, and the user cannot tell whether the payment was submitted or charged.

Diagnostic Checklist & Probable Root Cause (For QA/Dev)

• Probable Area of Failure:
  • Promo code / coupon handling (e.g., discount application producing an invalid amount or session state, or a 100%-off / zero-amount edge case)
  • Stripe Checkout session or PaymentIntent confirmation request hanging or never resolving (missing webhook handling or unhandled promise on the frontend)
  • iOS Safari-specific behavior (e.g., Intelligent Tracking Prevention blocking third-party cookies, 3DS/redirect popup blocked, payment-sheet or Apple Pay interaction issue)
• Info Needed to Verify:
  • Stripe Dashboard logs for the customer's session/PaymentIntent (status, errors, whether a charge or incomplete intent was created)
  • Browser console logs and HAR/network capture from iOS Safari (via Mac Web Inspector) showing the stalled request
  • Backend/server logs and webhook delivery logs around the time of the attempt
  • Screen recording or screenshot of the stuck state, plus exact timestamp and customer ID
  • Repro without the promo code (annual plan only) on the same device
  • Repro with the promo code on desktop Chrome and on another iOS Safari version
  • Repro with a monthly plan + promo code to isolate plan vs. promo cause
  • Check whether the customer was double-charged or has a pending/incomplete subscription