[Intake] Payment form crashes when selecting EUR currency

[chrizbo]

Request Type

Bug Report

Summary

The payment form crashes with a JavaScript error when a user selects EUR as their currency in the EU payment flow. The page becomes unresponsive and requires a hard refresh.

Problem or Pain Point

• Current behavior: Selecting EUR from the currency dropdown throws an uncaught TypeError and freezes the form
• This affects all EU customers trying to make payments in Euros
• Happens on every attempt — 100% reproducible
• Impact: Users cannot complete purchases in EUR, which is the primary currency for 3 of our 5 EU target markets

Proposed Solution (Feature) / Steps to Reproduce (Bug)

1. Go to the checkout page
2. Select "Europe" as the billing region
3. In the currency dropdown, select "EUR"
4. Observe: Page freezes, console shows TypeError: Cannot read properties of undefined (reading 'format')

Expected: Currency selector updates the price display to EUR formatting
Actual: Page crash with TypeError

Urgency

High — blocking or significantly impacting work

Who is affected?

All EU customers attempting to pay in EUR — estimated ~2,000 users/month based on current EU traffic. This directly blocks the EU Payment Methods launch (#3).

Success Criteria

• EUR currency selection works without errors
• Price displays correctly in € format
• No console errors during currency switching
• EU checkout completion rate returns to baseline

Additional Context

Related to launch #3 (EU Payment Methods). This may be caused by a missing locale configuration for the EUR formatter. The GBP and CHF currencies work fine.

[chrizbo]

🔍 Triage Assessment

Request Overview

Field	Value
Type	Bug Report
Urgency	High — blocking or significantly impacting work
Affected Users	All EU customers attempting to pay in EUR (~2,000 users/month)

📊 RICE Score: 36,000 (rice:high)

Factor	Value	Reasoning
Reach	6,000 users/qtr	~2,000 EU EUR users/month × 3 months
Impact	3 (massive)	100% reproducible crash that completely blocks checkout — zero workaround for affected users
Confidence	1.0 (high)	Exact repro steps, clear expected vs. actual behavior, specific error message, success criteria well defined
Effort	0.5 person-weeks	Likely a missing locale config for the EUR formatter (GBP and CHF work fine — isolated issue)
Score	36,000	(6,000 × 3 × 1.0) / 0.5

🎯 Kano Classification: Must-Be

This is a core checkout flow crash. Users expect to be able to select their currency and complete a purchase — the absence of this working correctly causes direct dissatisfaction and blocks revenue. Classic Must-Be: fixing it doesn't delight users, but the bug's presence is unacceptable.

🧭 Strategy Alignment

Aligns with Tradeoff #1 — "Ship to learn, even over planning to be right": Resolving this blocker unblocks the EU Payment Methods launch (#3), which is how the team learns about EU market fit. Keeping it broken stalls the learning cycle.

No conflicts with any other strategic tradeoffs.

🔄 Current Work Status

✅ Directly related to active launch #3 — [Launch] EU Payment Methods. The issue body explicitly calls this out, and launch #3 targets EU customers with SEPA and iDEAL payment methods. A EUR currency crash is a blocking defect for this launch. This should be treated as a launch-blocker and escalated to the DRI (@chrizbo).

🔗 Related Issues

• #3 — [Launch] EU Payment Methods (active launch, directly impacted — this bug is a launch blocker)

No other duplicate or closely related issues found in open or recently closed issues.

📋 Recommendation

This is a high-severity launch blocker with a massive RICE score. It should be prioritized immediately and assigned to the EU Payment Methods launch (#3) as a blocking defect. Given the likely root cause (missing EUR locale config vs. the working GBP/CHF paths), the fix is likely low-effort and high-value — a very favorable trade.

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Auto-generated by the Intake Triage workflow. Scores are estimates — use as a starting point for discussion.

🧾 Workflow Run Cost

Metric	Value
Input tokens	~4,200
Output tokens	~800
Total tokens	~5,000
Premium requests	1
Estimated cost	~$0.04

Cost estimate based on current Copilot pricing. Actual billing may vary.

Generated by Intake Request Triage for issue #108 · ● 222.3K · ◷