One API.Every provider behind it.

Predictable REST resources, idempotent writes, signed webhooks and a sandbox that simulates providers, declines and 3DS. Integrate once; routing decides the rest.

const payment = await tpp.payments.create({
  amount: 12800,
  currency: "EUR",
  payment_method: { token: "tok_…" },
  routing: { profile: "eu-cards-default" },
  merchant_id: "mer_sample_01",
}, { idempotencyKey: "order-8841" });

// payment.status → "authorized"
// payment.route  → { provider: "acquirer_a", attempt: 1 }

Six concepts cover the whole API.

First sandbox payment in four steps.

Click a step to view it. Everything here runs against the sandbox — no real money, simulated providers.

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Simulate providers, declines and cascades.

The sandbox is a separate environment with its own keys. Test card numbers and amounts trigger specific outcomes so you can exercise your error handling, 3DS flows and webhook consumers before go-live.

Guides by integration shape.

Thin, generated clients — the REST API is the source of truth.

Server libraries wrap authentication, idempotency and retries; the web component handles hosted fields. Published libraries will be listed here with versions as they ship.