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Slash Payment Processing is in beta and not enabled for all accounts. Contact support@joinslash.com to get access.
Slash Checkout lets you accept card payments — including Apple Pay and Google Pay — on your own site by embedding a Slash-hosted checkout in an iframe. You create a checkout session server-side with your API key, then mount its url with the @slashfi/checkout-js SDK. Slash renders the payment form, processes the charge, and notifies your backend when it settles. Slash Checkout is available to accounts enabled for hosted card payments. If payment processing is not enabled for your account (or your account is on a processing setup that doesn’t support hosted checkout), POST /checkout-session returns a 400.

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How it works

  1. Your backend calls POST /checkout-session and gets back a hosted url.
  2. Your page mounts that url with the SDK; the buyer pays in the embed.
  3. Slash settles the charge, marks the session complete, and sends a checkout_session.completed webhook.
  4. Your backend fulfills the order from that webhook.

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Fulfillment

Fulfill orders from the checkout_session.completed webhook, or by reading GET /checkout-session/{id} and checking for status: "complete". The SDK’s onComplete callback is a browser signal for updating the UI — a buyer can forge it, so never grant goods or services on that alone. See the Quickstart to accept your first payment.