Gluwa SDK for JavaScript (Node.js)

If your service is developed in Node.js, the features we provide are available through the SDK. The Gluwa SDK for Node.js is a library with powerful features that enable Node.js developers to easily make requests to the Gluwa APIs.

Getting started

Install the npm package on your Node.js server.

$ npm install @gluwa/gluwa-js

Never use Gluwa SDK on the client side or make your private key public.

Create and initialize a Gluwa object. Then, enter the APIKey, APISecret and WebookSecret generated from the Gluwa Dashboard, and an Ethereum wallet to manage your funds. Please note that the sandbox environment is deprecated and will be replaced with an alternative solution in the future.

const GluwaJS = require('@gluwa/gluwa-js');

const GluwaConfig = {
    production: {
        APIKey: '{Your production API Key}',
        APISecret: '{Your production API Secret}',
        WebhookSecret: '{Your production Webhhok Secret}',
        MasterEthereumAddress: '{Your Ethereum Address for production}',
        MasterEthereumPrivateKey: '{Your Ethereum Private Key for production}',
        isDev: false,
    },
    sandbox: {
        APIKey: '{Your sandbox API Key}',
        APISecret: '{Your sandbox API Secret}',
        WebhookSecret: '{Your sandbox Webhhok Secret}',
        MasterEthereumAddress: '{Your Ethereum Address for sandbox}',
        MasterEthereumPrivateKey: '{Your Ethereum Private Key for sandbox}',
        isDev: true,
    },
}

const Gluwa = new GluwaJS(GluwaConfig.production);

Now you are ready to use the Gluwa API.

Method Examples

Create a New Transaction

const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
const Amount = '{Send Amount}'; // e.g 1.581
const Target = '{Receiver`s Address}'; // e.g 0xf04349B4A760F5Aed02131e0dAA9bB99a1d1d1e5

const resultPromise = await Gluwa.postTransaction(Currency, Amount, Target);

Create a Payment QR Code

const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
const Amount = '{Send Amount}'; // e.g 1.581
const Optionals = {
    Note: '', // optional
    MerchantOrderID: '', // optional
    Expirty: '1800', // optional, it must be a string
};

const resultPromise = await Gluwa.getPaymentQRCode(Currency, Amount, Optionals);

getPaymentQRCode API returns a QR code png image as a Base64 string. You can display the image on your website as below:

<img src="data:image/png;base64,{BASE64_STRING_YOU_RECEIVED}" alt="Gluwa Payment QR Code">

List Transaction History for an Address

const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
const Optionals = {
    Limit: '100', // optional, it must be a string
    Offset: '0', // optional, it must be a string
    Status: 'Confirmed', // optional
};

const resultPromise = await Gluwa.getTransactionHistory(Currency, Optionals);

Retrieve Transaction Details by Hash

const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
const Hash = '{Transaction hash}';

const resultPromise = await Gluwa.getTransactionDetail(Currency, Hash);

Retrieve a Balance for an Address

const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG

const resultPromise = await Gluwa.getAddresses(Currency);

Webhook Validation

When user completes transfer via the QR code, the Gluwa API sends a webhook to your webhook endpoint. Verify that the values ​​actually sent by the Gluwa server are correct.

Verify the requested Signature and Payload as follows:

// Payload example
// {"ID":"9d238b83-e5c7-4a1e-a6b4-5bf7ec1d0218","CreatedDateTime":"2021-01-06T07:46:50.2779406Z","ResourceType":"Transaction","EventName":"TRANSACTION.CREATED","Summary":"A transaction was created.","Resource":{"ID":"62e667cf-1a80-41bf-b064-925999ed5b76","TxHash":"0x89a5d4cb0f1d6b919a4ada42b661ed7b2574ec4dd2d640f5c92642bad532dbe0","Source":"0xf04349B4A760F5Aed02131e0dAA9bB99a1d1d1e5","Target":"0x084Af3876A220F4732e21F7617dc212BB2A1f32E","Amount":"10","Fee":"0.5","Currency":"sUSDCG","Status":"Confirmed"}}

// Signature example
// 7iPzvTRVR81cuZQetKbF1GaGPIk1UkzyvFc6hhgA+VI=

const resultBoolean = Gluwa.validateWebhook(Payload, Signature);

How to resolve promise

All functions except Webhook Validation return promise. This can be used by resolving it like this:

resultPromise.then((result) => {
    console.log(result);
}).catch((error) => {
    console.warn(error);
});