Node.js SDK

Introduction

To create payments, you need to link your server to our platform via one of our integration methods.
Our Node.js SDK library is the ideal solution to connect to our platform if you prefer to do so with your own stand-alone system using Node.js language.

Choosing the Node.js SDK, you can:

• Access all functionalities of our RESTful API in a compact, convenient and customisable way.
• Use all server-sided integration methods of our platform (Hosted Checkout Page / Hosted Tokenization Page / Server-to-server).
• Make all payment processing-related API calls (i.e. CreateHostedCheckout, CreatePayment, RefundPayment and many more).

To take full advantage of this SDK, make sure you meet these requirements:

• Node.js 8 or higher

Install the latest version of the Node.js SDK using NPM package manager by running:

npm i onlinepayments-sdk-nodejs

Find more details on GitHub. Also, check out all available SDK objects and properties in our Full API Reference. Once you are all set, read the next chapters on how to prepare and use the SDK.

Initialisation

To connect your system to our platform by using the SDK, you need to initialise it at first.

Initialising the SDK requires you to

• Create test/live account.
• Create an API Key and API Secret for the PSPID you wish to use for transaction processing.
• Initialise an instance of directSdk using the API Key / API Secret to set up the connection to our test/live platform.
  
  

After initialisation, you can start processing transactions via your PSPID. Learn how this works in the dedicated chapter.

Have a look at code samples of two connection methods covering the steps mentioned above:

const onlinePaymentsSdk = require('onlinepayments-sdk-nodejs');

const directSdk = onlinePaymentsSdk.init({
    integrator: '[your-company-name]', // used for identification in logs
    host: 'payment.preprod.payone.com', // Note: Use the endpoint without the /v2/ part here. This endpoint is pointing to the TEST server
    scheme: 'https', // default
    port: 443, // default
    enableLogging: true, // defaults to false
    logger: logger, // if undefined console.log will be used
    apiKeyId: '[your-api-key-id]',
    secretApiKey: '[your-secret-api-key]'
});

The following table provides an overview of the arguments accepted by the individual instances:

After you have initialised the SDK, you can send requests to our platform via your PSPID. Learn how to do this in the next chapter.

Use SDK

After the successful initialisation of the directSdk instance, you gain full access to our RESTful API. It enables you to:

• Send requests for new transactions for any of our server integration methods.
• Get your transactions’ current status.
• Perform maintenance requests (i.e., captures, refunds) on existing transactions.

Check out our test cases in GitHub, including full code samples, and our Full API Reference to learn what is possible.

Below you may find some of the most common actions you can perform:

• Create new transactions
• Get transaction status
• Perform maintenance operation

Create new transactions

To create a new transaction, you can use a directSdk instance for any of our integration methods to create a new transaction. It can be done through:

• Routing the request to your PSPID on our platform (for directSdk).
• Creating a request for the respective integration methods.

Get transaction status

Our RESTful API allows you to request a transaction’s status anytime by one of our GET calls:

• GetHostedCheckout
• GetPaymentDetails
• GetCaptures
• GetRefunds

A GetPaymentDetails request looks like this:

const merchantId = "PSPID";
const sdkResponse = await directSdk.payments.getPaymentDetails(merchantId, 'PAYMENT_ID',{});

For more information about statuses visit the status documentation page.

Perform maintenance operation

To perform follow-up actions on existing transactions (i.e. captures or refunds), use our CapturePayment or RefundPayment API call respectively:

CapturePayment

/* 
 *…. Initialisation....
 */
const merchantId = "PSPID";
const sdkResponse = await directSdk.payments.capturePayment(
merchantId,
"PAYMENT_ID",
{
amount: 2980,
isFinal: true,
},
{}
);

RefundPayment

/*  
 *…. Initialisation.... 
 */ 
 
const merchantId = "PSPID";
const sdkResponse = await directSdk.payments.refundPayment(
merchantId,
"PAYMENT_ID",
{
amountOfMoney: {
currencyCode: "EUR",
amount: 1,
},
},
{}
);

Below you can find code samples related to particular integration methods:

• Hosted Checkout Page
• Hosted Tokenization Page
• Server-to-server

Hosted Checkout Page

To use this integration method, you need to create a CreateHostedCheckoutRequest call. It must contain at least an Order object.

/* 
 *…. Initialisation....
 */

const merchantId = "PSPID";
const sdkResponse= await directSdk.hostedCheckout.createHostedCheckout(
merchantId,
{
order: {
amountOfMoney: {
currencyCode: "USD",
amount: 2345,
},
customer: {
merchantCustomerId: "1234",
billingAddress: {
countryCode: "US",
},
},
},
hostedCheckoutSpecificInput: {
variant: "testVariant",
locale: "en_GB",
},
},
{}
);

This call returns a CreateHostedCheckoutResponse response. Store the hostedCheckoutId and RETURNMAC it contains, as well as any other information relevant for you. You will need these for steps described in the following chapters.

This response also contains a partialRedirectURL.

You have to concatenate the base URL "https://payment." with partialRedirectURL according to the formula

https://payment. + partialRedirectURL

and perform a redirection of your customer to this URL. Once the customer visits the Hosted Checkout Page, the payment process continues there.

Hosted Tokenization Page

To use this integration method, you need to

• Create and upload a template as described in our Hosted Tokenization Page guide

// Initialisation

const merchantId = "PSPID";
const sdkResponse = await directSdk.hostedTokenization.createHostedTokenization(
merchantId,
{
askConsumerConsent: true,
locale: "en_GB",
variant: 'YOUR_TEMPLATE.html',
}, 
{}
);

From sdkResponse retrieve hostedTokenizationId and partialRedirectUrl. Use the partialRedirectUrl for the iframe and the hostedTokenizationId or tokenId (see infobox) to create the actual payment via Server-to-server integration method.

// Initialisation

const merchantId = "PSPID";
const sdkResponse = await directSdk.payments.createPayment(
merchantId,
{
cardPaymentMethodSpecificInput: {
card: {
cvv: "123",
cardNumber: "4567350000427977",
expiryDate: "1220",
cardholderName: "Wile E. Coyote",
},
token: 'TOKEN_FROM_HOSTED_TOKENIZATION_RESPONSE',
},
order: {
amountOfMoney: {
currencyCode: "EUR",
amount: 2980,
},
},
},
  {}
);

Server-to-server

A minimum paymentResponse requires you to set at least an Order object and a payment method:

// The example object of the AmountOfMoney
 const merchantId = "PSPID";
const sdkResponse = await directSdk.payments.createPayment(
merchantId,
{
cardPaymentMethodSpecificInput: {
card: {
cvv: "123",
cardNumber: "4567350000427977", // // Find more test data here 
expiryDate: "1220",
cardholderName: "Wile E. Coyote",
},
paymentProductId: 3,
},
order: {
amountOfMoney: {
currencyCode: "EUR",
amount: 2980,
},
},
},
{}
);

Handle exceptions

If a transaction is rejected, our platform provides detailed information with an Exception instance. The affiliated HTTP status code also help you troubleshoot the error.

You can encounter two types of exceptions: transaction exceptions and HTTP exceptions.

Transaction exceptions

This kind of exception refers to transaction requests that are technically correct but were rejected by your customer’s issuer or your acquirer. If the transaction is returned in the exception, it means that it was created in our systems but not successfully processed.

// Initialisation
const merchantId = "PSPID";
let paymentId = null;
try {
paymentId = directSdk.payments.createPayment(merchantId, {}, {});
} catch (error) {
console.error(error);
return;
}

const payment = await directSdk.payments.getPayment(merchantId, paymentId, {});

if (isNotSuccessful(payment)) {
handleError(payment);
}

// Initialisation

const merchantId = "PSPID";
const payId = "PAY_ID";
let refundId = null;

try {
refundId = await sdkInstance.payments.refundPayment(
merchantId,
payId,
{
amountOfMoney: {
currencyCode: "EUR",
amount: 1,
},
},
{}
);
} catch (error) {
console.error(error);
return;
}

const refunds = await directSdk.payments.getRefunds(merchantId, payId, {});

if (isNotSuccessful(refunds, refundId)) {
handleError(refunds);
}

HTTP exceptions

This kind of exception refers to various problems caused by technical errors in the API call or payment request.

You can combine any of the following code snippets with this standard CreatePayment request:

// Initialisation
const merchantId = "PSPID";
const sdkResponse = null;
try {
sdkResponse = await directSdk.payments.createPayment(
merchantId,
{
cardPaymentMethodSpecificInput: {
card: {
cvv: "123",
cardNumber: "4567350000427977",
expiryDate: "1220",
cardholderName: "Wile E. Coyote",
},
paymentProductId: 3,
},
order: {
amountOfMoney: {
currencyCode: "EUR",
amount: 2980,
},
},
},
{}
);
} catch (error) {
// something went wrong, lets log it...
console.error(error);
return;
}
if (sdkResponse.errors.length > -1) {
// we've got a specific error 
sdkResponse.forEach((error) => {
// your error handling logic
console.error(error);
});
}

if (response.status === 400) {
console.log("Input validation error:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}

if (response.status === 403) {
console.log("Authorization error:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}

if (response.status === 409) {
console.log("Authorization error:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}}

if (
response.status === 404 ||
response.status === 409 ||
response.status === 410
) {
console.log("Incorrect object reference:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}}

if (
response.status === 500 ||
response.status === 502 ||
response.status === 503
) {
console.log(" Error occurred at Direct or a downstream partner/acquirer:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}}

if (response.errors.length > -1) {
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}}

if (response.status.match(/3[0-9]{2}\b/)) {
console.log("Communication error:");
response.errors.forEach((error) => {
console.log(error.code, error.message);
});
}}

HTTP status codes

All our exceptions are linked to one or more HTTP status codes, indicating the root cause for many possible errors.

DeclinedPaymentException

DeclinedPayoutException

DeclinedRefundException

ValidationException

AuthorizationException

ReferenceException

IdempotenceException
ReferenceException

ReferenceException

DirectException

DirectException

DirectException

ApiException

Additional Features

The SDK has a lot more to offer. Have a look at the following features, as they will help you build the perfect solution.

• Get available payment methods
• Send idempotent requests
• Use logging
• Webhooks

Get available payment methods

Before you initiate the actual payment process, you send a GetPaymentProducts request to our platform. The response contains a list of available payment methods in your PSPID. Depending on your customers’ preferences, you can offer a selection on our Hosted Checkout Page or on your own webshop environment using subsequent CreatePayment requests.

// Initialisation
const merchantId = "PSPID"

const paymentProducts = await directSdk.products.getPaymentProducts(merchantId, {
countryCode: 'NL',
currencyCode: 'EUR',
});

Send idempotent requests

One of the main REST API features is its ability to detect and prevent sending requests (i.e. payment requests) accidentally twice. The SDK makes it very easy for you to ensure that you send only unique – idempotent – requests to our platform.

Use the additional argument paymentContext and set its property named idempotence to a CreatePayment request. The SDK will send an X-GCS-Idempotence-Key header with the idempotence key as its value.

If you send requests this way to our platform, we will check the following

• If you send subsequent request with the same idempotence key, the response contains an X-GCS-Idempotence-Request-Timestamp header. The SDK will set the idempotenceRequestTimestamp property of the CallContext argument.
• If the first request is not finished yet, the RESTful Server API returns a 409 status code. Then the SDK throws an IdempotenceException with the original idempotence key and the idempotence request timestamp.

// Initialisation

const merchantId = "PSPID";

directSdk.payments.createPayment(
merchantId,
{
cardPaymentMethodSpecificInput: {
card: {
cvv: "123",
cardNumber: "4567350000427977",
expiryDate: "1220",
cardholderName: "Wile E. Coyote",
},
paymentProductId: 3,
},
order: {
amountOfMoney: {
currencyCode: "EUR",
amount: 2980,
},
},
},
{ idemPotence: { key: "YourKeyForThePayment" } },
(error, sdkResponse) => {
if (directSdk.context.getIdempotenceRequestTimestamp()) {
// this call is made with idempotence and is still being handled
console.log(
"idempotence timestamp",
directSdk.context.getIdempotenceRequestTimestamp()
);
}
}
);

Use logging

The SDK supports logging of requests, responses, and exceptions of the API communication. These can be helpful for troubleshooting or tracing individual steps in the payment flow.

To use this logging feature, you should implement the CommunicatorLogger interface.

The SDK offers two implementations of the logging feature:

• System.out (SysOutCommunicatorLogger)
• java.util.logging.Logger (JdkCOmmunicatorLogger)

To use this feature, provide an implementation of the Logger interface . You can enable/disable the logging by setting the enableLogging property on a directSdk object and providing the logger as an argument logger.

Webhooks

The part of the SDK that handles the webhooks support is called the webhooks helper. It transparently handles both validation of signatures against the event bodies sent by the webhooks system (including finding the secret key for key IDs - not to be confused with the API Key and API Secret), and unmarshalling of these bodies to objects. This allows you to focus on the essentials, without going through all the additional information and extracting the desired ones by yourself. To learn more about webhooks, read our dedicated guide. 

Provide secret keys

Configure the "WebhooksKey" / "WebhooksKeySecret" and your server webhooks endpoints in the Merchant Portal:

keyId = '[WebhooksKey"]',
secretKey = '[WebhooksKeySecret]'

Secret keys are provided using a function that takes two arguments:

• The key ID to return the secret key.
• A callback function that either takes an error as its first argument, or the secret key for the given key ID as its second argument (in which case the first argument must be null).

The SDK provides one implementation for this function: webhooks.inMemorySecretKeyStore.getSecretKey. This will retrieve secret keys from an in-memory key store.

You can add or remove keys using the following functions:

• webhooks.inMemorySecretKeyStore.storeSecretKey(keyId, secretKey) to store a secret key for a key ID.
• webhooks.inMemorySecretKeyStore.removeSecretKey(keyId) to remove the stored secret key for a key ID.
• webhooks.inMemorySecretKeyStore.clear() to remove all stored secret keys.

If you require more advanced storage, e.g. for a database or file system, we recommend writing your own implementation.

Initialise webhooks helper

Include and initialise the webhooks helper as follows:

// Initialisation
const webhooks = require("direct-sdk-nodejs").webhooks;
// replace webhooks.inMemorySecretKeyStore.getSecretKey with your own function if needed
webhooks.init({
    getSecretKey: webhooks.inMemorySecretKeyStore.getSecretKey,
});

Use webhooks helper

From an entry point that you have created on your own, call the unmarshal method of the webhooks instance. It takes the following arguments:

• The body as a string or buffer. This should be the raw body as received from the webhooks system.
• An object containing the request headers as received from the webhooks system. The keys should be the header names.

// Initialisation
webhooks.unmarshal(body, requestHeaders, (error, event) => {
    if (error) {
        // something went wrong in validating the signature or unmarshalling the event
    } else {
        // process the event
    }
});