Billing Issue – Subscription Payment Declined and Unable to Subscribe

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 15.1.1 (24B2091)

### Expected behaviour

I expected to be able to successfully complete my subscription payment without any issues. The payment should be processed and the subscription should activate normally.

### Actual behaviour

Every time I try to subscribe, the payment is rejected and the transaction is declined. I am unable to complete the subscription process.
I am not sure why this is happening because my payment method is valid and has sufficient funds. I also tried multiple attempts but the issue persists.

### Steps to reproduce

Go to the Kiro website.
Navigate to the subscription / billing page.
Select the $40 subscription plan.
Enter valid payment details.
Submit the payment.
The transaction is declined and the subscription cannot be completed.

### Environment

```yaml

[q-details]
version = "2.5.0"
hash = "9595f8ef1891859828df3785e926266512d6762b"
date = "2026-05-28T23:17:47.748855Z (3d ago)"
variant = "full"

[system-info]
os = "macOS 15.1.1 (24B2091)"
chip = "Apple M4"
total-cores = 10
memory = "16.00 GB"

[environment]
cwd = "/Users/USER/workspace/vatrenas"
cli-path = "/Users/USER/workspace/vatrenas"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "iTerm 2"
install-method = "unknown"

[env-vars]
PATH = "/opt/homebrew/opt/node@18/bin:/Users/USER/.rbenv/shims:/bin:/Users/USER/.local/share/mise/installs/ruby/3.4.1/bin:/Users/USER/.local/bin:/opt/homebrew/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Applications/iTerm.app/Contents/Resources/utilities:/Users/USER/ngrok"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.googlecode.iterm2"
```