SixPay provides a checkout flow for on-chain payments while keeping the merchant’s own order system as the source of truth for catalog, fulfillment, and customer service.

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SixPay handles

  • Resolving the merchant’s settlement configuration.
  • Connecting a customer wallet and letting the customer choose or switch wallets.
  • Loading eligible payment assets and quotes.
  • Creating, signing, and submitting payment intents.
  • Showing payment progress and polling the platform order state.
  • Returning a browser-safe checkout-session snapshot, including item presentation and promotion pricing.
  • Delivering signed order events to the merchant webhook endpoint.

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The merchant handles

  • Creating and pricing the merchant order before payment.
  • Keeping the Merchant API Key and calculating trusted item quantities and amounts on the server.
  • Passing only the checkout session ID and checkout token to the browser.
  • Verifying, deduplicating, and applying webhook events to the merchant’s order state.
  • Product fulfillment, refunds, and customer support policies.

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Trust boundary

The browser must never receive an mapi_... Merchant API Key. A checkout token is deliberately narrower: it is short-lived and can access only its session’s safe snapshot and promotion operations.