Take a real payment in the Unipaas sandbox with a single server-to-server call, no vendor setup and no onboarding. You create a checkout, open the link Unipaas returns, and pay it with a test card. That same call hands you everything you need to choose your integration path next.

Before you start

• A sandbox account. Create one; it is free and instant.
• Your sandbox private key, from your portal account settings.
• The sandbox base URL: https://sandbox.unipaas.com/platform.

Create a checkout

Make one call from your server to create a checkout. It takes your private key in the Authorization header and four fields: the amount, the currency, the shopper’s country, and their email. Amounts are in the major currency unit, so 10 is 10.00.

Caution

This call runs on your server. It uses your private key, your secret credential, which must never be exposed in the browser.

curl -X POST https://sandbox.unipaas.com/platform/pay-ins/checkout \
  -H "Authorization: Bearer <PLATFORM_API_KEY>" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 10,
    "currency": "GBP",
    "country": "GB",
    "email": "shopper@example.com"
  }'

See it work

Unipaas responds with 201 Created and the checkout object. Two fields matter right now:

{
  "id": "6839...c1d",
  "status": "open",
  "amount": 10,
  "currency": "GBP",
  "shortLink": "https://sandbox-checkout.unipaas.com/-0_lisK298/",
  "sessionToken": "eyJhbGciOiJI...",
  "expiresAt": "2026-06-25T18:30:00.000Z"
}

• shortLink is a hosted checkout page. Open it in your browser.
• sessionToken is a short-lived token for the embedded Web SDK path; you use it below.

Open the shortLink. You will see a branded, PCI-compliant checkout for the amount you set. Pay it with a test card to complete your first sandbox payment.

Next steps

You have taken a payment. Now choose how to integrate:

• Hosted checkout - redirect shoppers to the shortLink you just used. See Checkout Page.
• Embedded Web SDK - keep shoppers on your page with Unipaas-hosted secure card fields, using the sessionToken from the call above. See Web SDK.
• Client-side calls - if your app calls Unipaas from the browser, such as embedded onboarding, mint a scoped token first. See Authentication.