Interact with ioPay Desktop

Client-side, you can use the iotex-antenna@latestpackage. Below is an example of setting up WsSignerPlugin to connect to the wallet: it is nothing more than passing the plugin as a dependency when calling the Antenna object constructor.
The client-side code looks like this:
import sleepPromise from "sleep-promise";
import Antenna from "iotex-antenna";
import { WsSignerPlugin } from "iotex-antenna/lib/plugin/ws";
import { toRau } from "iotex-antenna/lib/account/utils";
import { Contract } from "iotex-antenna/lib/contract/contract";
(async () => {
const antenna = new Antenna("", {
signer: new WsSignerPlugin()
await sleepPromise(3000);
// example for transfer
let resp = await antenna.iotx.sendTransfer({
to: "io1mwekae7qqwlr23220k5n9z3fmjxz72tuchra3m",
from: antenna.iotx.accounts[0].address,
value: toRau("1", "Iotx"),
gasLimit: "100000",
gasPrice: toRau("1", "Qev")
// example for contract call
// option 1: using simple executeContract shortcut
resp = await antenna.iotx.executeContract(
contractAddress: "io1jmq0epcswzu7vyquxlr9j9jvplwpvtc4d50ze9",
amount: "0",
method: "set",
gasLimit: "100000",
gasPrice: toRau("1", "Qev"),
from: antenna.iotx.accounts[0].address
// example for contract call
// option 2: using full-featured contract class
const contract = new Contract(
constant: false,
inputs: [{ name: "x", type: "uint256" }],
name: "set",
outputs: [],
payable: false,
stateMutability: "nonpayable",
type: "function"
constant: true,
inputs: [],
name: "get",
outputs: [{ name: "", type: "uint256" }],
payable: false,
stateMutability: "view",
type: "function"
{ provider: antenna.iotx, signer: antenna.iotx.signer }
resp = await contract.methods.set(999, {
account: antenna.iotx.accounts[0],
gasLimit: "300000",
gasPrice: "1000000000000",
amount: toRau(0, "IOTX")
console.log(`contract.set() => ${resp}`);
await sleepPromise(20000);
resp = await contract.methods.get({ from: antenna.iotx.accounts[0].address });
console.log(`contract.get() => ${resp}`);
Before sending the transfer or the contract call above, you need to open and unlock IoPay Desktop Wallet on the client machine. Once the wallet is ready and unlocked, you can run the script below in both the browser and the node environment, and then you can see the message to sign. Please click "Yes, sign transaction" in IoPay Wallet to continue and sign the message with the unlocked account.