VOLUNTARY TRANSACTION PROTECTION

A second key for protected spending.

SECONDKEY is a voluntary two-person approval system for selected card transactions. The cardholder chooses the purchases that require a trusted person’s approval—adding a deliberate second step before protected spending can proceed.

SECONDKEY is currently an internal sandbox prototype. It is not a publicly available financial product and does not issue live cards.

Purchase protection

Sandbox demonstration

SECONDKEY

•••• 2048

VIRTUAL • SANDBOX

Northstar Electronics

Protected purchase • USD

$249.00

First attempt

Approval required

Trusted-person approval received

Exact merchant and amount are approved for a single retry.

Temporary exception

Approved for one retry

HOW IT WORKS

Protection without surrendering control.

The cardholder voluntarily selects a trusted person and defines which transactions require a second approval. The trusted person does not control the account or move funds—they can only approve or pause a specific protected purchase.

Purchase attempted

The cardholder attempts a transaction covered by a protection rule.

First attempt declined

The card declines the initial authorization and identifies that approval is required.

Request delivered

The trusted person receives the merchant, amount, and approval request.

Approve or pause

They approve that exact purchase or leave it paused.

Temporary exception

Approval creates a short, single-use exception for that merchant and amount.

Retry succeeds

The cardholder retries the purchase and the matching authorization is approved.

PRODUCT PRINCIPLES

Designed around consent and precision.

Voluntary by design

The cardholder chooses the trusted person, the rules, and whether to use the protection.

Transaction-specific

Approval applies only to the designated card, merchant, amount, currency, and time window.

Single-use access

The approval is consumed by one matching retry and cannot authorize unrelated spending.

Transparent history

Both participants can see the request, decision, expiration, and final outcome.

CURRENT DEVELOPMENT PHASE

Testing the authorization mechanism first.

The initial prototype is being developed using Stripe Issuing sandbox infrastructure, Supabase, and private web interfaces. Its purpose is to validate the complete authorization sequence before any consumer launch or live-card program is considered.

What the prototype tests

• First-attempt authorization decline
• Creation of an approval request
• Human approval or pause
• Exact merchant-and-amount matching
• Temporary single-use authorization exception
• Successful retry and sandbox capture
• Authorization latency and audit history

What it does not do

• Issue live consumer cards
• Process real funds
• Onboard external customers
• Replace an issuing bank
• Circumvent card-network or compliance requirements
• Operate as an autonomous purchasing agent

Cardholder attempt → Stripe Issuing authorization → SECONDKEY decision service → Trusted-person approval → Temporary exception → Matching retry approved

INSTITUTIONAL MODEL

Built to be evaluated with financial institutions.

SECONDKEY is intended to be tested with issuing banks, card programs, embedded-finance providers, risk teams, and financial-wellness organizations. Any future live implementation would require the appropriate issuing, compliance, operational, and consumer-protection partners.

Authorization control

A configurable approval layer applied during card authorization.

Institutional integration

Designed as potential infrastructure for an existing issuer or card program—not as an attempt to independently bypass one.

Responsible testing

Development begins with an isolated sandbox and internal test cardholders before any live pilot is considered.

Private sandbox research initiative

A deliberate pause before protected money moves.

SECONDKEY is exploring whether voluntary shared approval can become a practical financial safeguard—without giving another person ownership of the account or unrestricted control over the cardholder’s money.