feat: update test card to 4000 0200 0000 0000

[devin-ai-integration]

Summary

Updates the test card number shown in the onramp demo to 4000 0200 0000 0000. See Checkout.com test cards for additional scenarios.

Review & Testing Checklist for Human

• Run the demo locally (pnpm dev) and confirm the displayed card number is 4000 0200 0000 0000 and the payment flow completes end-to-end

Link to Devin session: https://crossmint.devinenterprise.com/sessions/87e7ee8f82e94d759b5a2fdfb04db123
Requested by: @jcurbelo

[devin-ai-integration]

Original prompt from Robin

SYSTEM:
=== BEGIN THREAD HISTORY (in #prod-onramp) ===
Robin Curbelo (U07V6DK170F): hey team, getting 500s with our staging onramp demo, im currently at the consensus booth trying to showcase our onramp 😅

[Slack unfurl — this is an automatic link preview, not a user message]
Quote of conversation (https://crossmint.slack.com/archives/C05E8AU261H/p1778078584244379?thread_ts=1778078584.244379&cid=C05E8AU261H):
> From Robin Curbelo
> hmm getting internal server error with

> ```POST <https://staging.crossmint.com/api/2022-06-09/orders/e950570b-0c4f-4b34-9163-7de998a60cea/payment>

> {"statusCode":500,"message":"Internal server error"}```

> ATTACHMENT:"https://crossmint.devinenterprise.com/attachments/ec52b689-c692-4b9d-95af-a91f41aabd51/Screenshot+2026-05-06+at+10.42.28%3FAM.png"
> Posted on May 06, 2026 at 02:43 PM

Robin Curbelo (U07V6DK170F): <https://app.datadoghq.com/logs?query=e950570b-0c4f-4b34-9163-7de998a60cea%2Fpayment&amp;amp;agg_m=count&amp;amp;agg_m_source=base&amp;amp;agg_t=count&amp;amp;cols=%40http.method%2C%40http.status_code%2C%40http.url_details.path&amp;amp;event=AwAAAZ39vRJimjTETQAAABhBWjM5dlJwV0FBQjJfNElNSHI3a093QUEAAAAkZjE5ZGZkYmQtNTE0MC00YTk0LTlhMzEtYzg4YWUwODAwNzQ0AAAAIw&amp;amp;fromUser=true&amp;amp;messageDisplay=inline&amp;amp;refresh_mode=sliding&amp;amp;storage=hot&amp;amp;stream_sort=desc&amp;amp;viz=stream&amp;amp;from_ts=1778077720268&amp;amp;to_ts=1778078620268&amp;amp;live=true>

  "code": "parameter_unknown",
  "doc_url": "<https://stripe.com/docs/error-codes/parameter-unknown>",
  "message": "Received unknown parameter: payment_method_options[card][recipient_details]",
  "param": "payment_method_options[card][recipient_details]",
  "request_log_url": "<https://dashboard.stripe.com/acct_1JzEp5FvmlcSW9dC/test/workbench/logs?object=req_Y8a3Wvzbi9Rw6O>",
  "type": "invalid_request_error"
} Error: No payment intent in response {
  "code": "parameter_unknown",
  "doc_url": "<https://stripe.com/docs/error-codes/par... (7905 chars truncated...)

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
onramp-embedded-quickstart	Ready	Preview, Comment	May 8, 2026 8:22pm