Gluwa SDK for Javascript (Node.js)

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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. 
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$ npm install @gluwa/gluwa-js
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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. You can use credentials from sandbox dashboard and a Rinkeby wallet if you want to test in the sandbox environment.
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const GluwaJS = require('@gluwa/gluwa-js');
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​
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const GluwaConfig = {
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    production: {
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        APIKey: '{Your production API Key}',
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        APISecret: '{Your production API Secret}',
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        WebhookSecret: '{Your production Webhhok Secret}',
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        MasterEthereumAddress: '{Your Ethereum Address for production}',
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        MasterEthereumPrivateKey: '{Your Ethereum Private Key for production}',
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        isDev: false,
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    },
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    sandbox: {
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        APIKey: '{Your sandbox API Key}',
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        APISecret: '{Your sandbox API Secret}',
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        WebhookSecret: '{Your sandbox Webhhok Secret}',
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        MasterEthereumAddress: '{Your Ethereum Address for sandbox}',
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        MasterEthereumPrivateKey: '{Your Ethereum Private Key for sandbox}',
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        isDev: true,
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    },
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}
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​
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const Gluwa = new GluwaJS(GluwaConfig.production);
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Now you are ready to use the Gluwa API.
Method Examples
​Create a New Transaction​
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const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
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const Amount = '{Send Amount}'; // e.g 1.581
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const Target = '{Receiver`s Address}'; // e.g 0xf04349B4A760F5Aed02131e0dAA9bB99a1d1d1e5
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​
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const resultPromise = await Gluwa.postTransaction(Currency, Amount, Target);
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​Create a Payment QR Code​
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const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
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const Amount = '{Send Amount}'; // e.g 1.581
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const Optionals = {
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    Note: '', // optional
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    MerchantOrderID: '', // optional
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    Expirty: '1800', // optional, it must be a string
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};
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​
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const resultPromise = await Gluwa.getPaymentQRCode(Currency, Amount, Optionals);
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getPaymentQRCode API returns a QR code png image as a Base64 string. You can display the image on your website as below:
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<img src="data:image/png;base64,{BASE64_STRING_YOU_RECEIVED}" alt="Gluwa Payment QR Code">
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​List Transaction History for an Address​
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const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
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const Optionals = {
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    Limit: '100', // optional, it must be a string
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    Offset: '0', // optional, it must be a string
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    Status: 'Confirmed', // optional
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};
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​
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const resultPromise = await Gluwa.getTransactionHistory(Currency, Optionals);
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​Retrieve Transaction Details by Hash​
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const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
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const Hash = '{Transaction hash}';
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​
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const resultPromise = await Gluwa.getTransactionDetail(Currency, Hash);
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​Retrieve a Balance for an Address​
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const Currency = '{USDG or sUSDCG or KRWG}'; // e.g USDG
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​
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const resultPromise = await Gluwa.getAddresses(Currency);
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​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:
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// Payload example
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// {"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"}}
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​
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// Signature example
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// 7iPzvTRVR81cuZQetKbF1GaGPIk1UkzyvFc6hhgA+VI=
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​
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const resultBoolean = Gluwa.validateWebhook(Payload, Signature);
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How to resolve promise
All functions except Webhook Validation return promise. This can be used by resolving it like this:
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resultPromise.then((result) => {
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    console.log(result);
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}).catch((error) => {
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    console.warn(error);
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});
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