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The SDK authenticates with the Oak Network API using OAuth2 client credentials. Token management is automatic — you pass your credentials once and the SDK handles the rest.

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How it works

import { createOakClient } from '@oaknetwork/payments-sdk';

const client = createOakClient({
  environment: 'sandbox',
  clientId: process.env.CLIENT_ID!,
  clientSecret: process.env.CLIENT_SECRET!,
});
When you create a client, it does not immediately request a token. The first token is fetched lazily — on the first API call that requires authentication.

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Token lifecycle

The SDK manages tokens internally through the AuthManager:
  1. On the first authenticated request, the SDK calls POST /api/v1/merchant/token/grant with your clientId and clientSecret
  2. The API returns an access_token and an expires_in value (in seconds)
  3. The SDK caches the token and converts the expiration to an absolute timestamp
  4. On subsequent requests, the cached token is reused
  5. When the token is within 60 seconds of expiring, the SDK automatically requests a fresh one
  6. Concurrent callers share a single in-flight refresh — no duplicate token requests
You never need to manually refresh tokens.

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Token request

// Request payload (sent automatically)
{
  client_id: "your-client-id",
  client_secret: "your-client-secret",
  grant_type: "client_credentials"
}

// Response
{
  access_token: "eyJhbGci...",
  token_type: "Bearer",
  expires_in: 3600
}

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Manual token access

In rare cases you may need the raw access token — for example, to make direct HTTP calls outside the SDK. 
const tokenResult = await client.getAccessToken();

if (tokenResult.ok) {
  const token = tokenResult.value;
  // Use token in a custom HTTP request
  fetch('https://sandbox-payments.oaknetwork.org/api/v1/some-endpoint', {
    headers: { Authorization: `Bearer ${token}` },
  });
} else {
  console.error('Token request failed:', tokenResult.error.message);
}
You can also call grantToken() to force a fresh token request regardless of cache state: 
const grantResult = await client.grantToken();

if (grantResult.ok) {
  console.log('Token type:', grantResult.value.token_type);
  console.log('Expires in:', grantResult.value.expires_in, 'seconds');
}

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Client configuration

FieldTypeRequiredDescription
environment"sandbox" | "production"YesTarget environment
clientIdstringYesOAuth2 client ID
clientSecretstringYesOAuth2 client secret
customUrlstringNoOverride the built-in API base URL
retryOptionsPartial<RetryOptions>NoOverride default retry behavior
clientSecret is not exposed on client.config after creation — store it separately if you need it for non-SDK purposes. All service methods handle authentication transparently. You only need to interact with getAccessToken() or grantToken() if you are making direct HTTP calls outside the SDK.