app.js

console.log("CoinApp Running");
const express = require('express');
const Client = require('coinbase').Client;
const app = express();
app.use(express.json());


const API_KEY = "";
const API_SECRET = "";
const DEFAULT_ACCOUNT = "primary";

const client = new Client({
    "apiKey": API_KEY,
    "apiSecret": API_SECRET,
    "api_version": "2021-01-22",
    "strictSSL": false
});

app.post('/send/', function (req, res) {
    const params = req.body;
    // const to = params.to;
    // const amount = params.amount;
    // const currency = params.currency;
    if (!params.accountID) {
        params.accountID = DEFAULT_ACCOUNT;
    }

    getAccount(client, params, res)
        .then((details) => {
            const account = details.account;
            console.log("getAccount:", account);
            return sendMoney(account, details.params)
                .then((output) => {
                    console.log("Successful: ", output);
                    res.status(200).send(output);
                });
        }).catch((err) => {
            switch (err.name) {
                case "ExpiredToken":
                    res.status(401).send("Coinbase session expired");
                    break;

                case "ValidationError":
                    res.status(400).send(err.message);
                    break;

                default:
                    res.status(400).send(err.message);
                    break;
            }
        });
});

function getAccount(client, params, res) {
    if (!client) {
        //Unauthorized 
        res.sendStatus(401);
        return;
    }
    return new Promise((resolve, reject) => {
        client.getAccount(params.accountID, function (err, account) {
            if (err) {
                reject(err);
                return;
            } else {
                resolve({
                    account,
                    params
                });
                return;
            }
        });
    });
}

function sendMoney(account, params) {
    return new Promise((resolve, reject) => {
        console.log("sendMoney: ", params);
        account.sendMoney({
            'to': `${params.to}`,
            'amount': `${params.amount}`,
            'currency': `${params.currency}`

        }, function (err, tx) {
            if (err) {
                console.log("ErrorName", err.name);
                reject(err);

            } else {
                resolve(tx);
                
            }
        });
    });
}

app.listen(3000);