[BUG] Max 5x → Max 20x upgrade stuck in void_invoice loop — server returns same canceled PaymentIntent on every retry

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Cannot upgrade my subscription from Max 5x to Max 20x on claude.ai. Every payment attempt fails with the same Stripe error referencing a canceled PaymentIntent.

Each upgrade attempt:

• PUT /api/organizations/[id]/upgrade_to_max returns 200 OK
• POST api.stripe.com/v1/payment_intents/pi_xxx/confirm returns 400 Bad Request

The server keeps returning the same canceled PaymentIntent ID (pi_3TQlueBjIQrRQnux1gqWfkg6) on every retry, instead of generating a fresh one. Each retry creates a new Stripe request log (different req_xxx), but Anthropic always confirms the same dead pi_xxx.

The card is never charged (last_payment_error: null, payment_method: null). The PaymentIntent is voided server-side ~140 seconds after creation with cancellation_reason: void_invoice. This is a state corruption on the Anthropic backend, not a card or client issue.

Stripe error response:

{
"error": {
"code": "payment_intent_unexpected_state",
"message": "This PaymentIntent's mandate_data could not be updated because it has a status of canceled.",
"payment_intent": {
"id": "pi_3TQlueBjIQrRQnux1gqWfkg6",
"status": "canceled",
"cancellation_reason": "void_invoice",
"last_payment_error": null,
"payment_method": null,
"amount": 16566,
"currency": "eur",
"description": "Subscription update"
},
"type": "invalid_request_error"
}
}

Stripe diagnostic IDs:

• PaymentIntent: pi_3TQlueBjIQrRQnux1gqWfkg6
• Stripe account: acct_1MExQ9BjIQrRQnux
• Latest request log: req_sm0K3k4ukXjU7I
• Account email: franckdunand@gmail.com

Likely related to: #45890, #43338, #46703, #41499, #32918 (same family of Anthropic/Stripe state desync bugs).

What Should Happen?

After a PaymentIntent is voided, the server should generate a fresh PaymentIntent on the next upgrade attempt.

Instead, the canceled PaymentIntent ID is persisted indefinitely on the Anthropic backend, leaving the account in a state where no upgrade or new subscription attempt can succeed without manual intervention.

Requesting a human reset of the subscription state for this account.

Error Messages/Logs

HTTP 400 Bad Request from api.stripe.com/v1/payment_intents/pi_3TQlueBjIQrRQnux1gqWfkg6/confirm

Error code: payment_intent_unexpected_state
Type: invalid_request_error

Steps to Reproduce

1. Account has active Max 5x subscription (purchased via web ~1 month ago, working normally)
2. Go to claude.ai Settings → Plan
3. Click upgrade to Max 20x
4. Submit payment with any card
5. Observe: PUT /upgrade_to_max returns 200, then Stripe confirm returns 400 with payment_intent_unexpected_state
6. Retry: same canceled pi_xxx returned every time

Already ruled out client-side causes:

• 4 browsers (Chrome, Safari, Firefox, Brave), private mode
• Full cache + cookies + storage wipe (claude.ai, js.stripe.com, api.stripe.com)
• 2 devices (Mac, iPhone)
• 3 different cards (Revolut, Qonto)
• VPN off
• Logged out and back in
• iOS app blocks subscription management ("purchased on another platform")
• Cancelled Max 5x and retried — same dead PaymentIntent still returned

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

last

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• OS: macOS Sequoia + iOS 17
• Browser: Chrome, Safari, Firefox, Brave (all tested)
• Claude Code version: latest
• Plan: Max 5x (active, attempting upgrade to Max 20x)
• Region: France (billing) / Bali (residence)
• Currency: EUR
• Date: April 28, 2026