Pay3 Javascript SDK
Functions

8min
pay3.connect()
Opens login modal of Pay3 web wallet. User will be able to connect to the wallet using Social, Email & Phone OTP or Wallet connect.
On completion of connecting pay3-sdk-login-status﻿ event is published to the DApp.  
index.js
// Open Pay3 Login Modal
pay3.connect();
// Open Pay3 Login Modal
pay3.connect();
﻿
pay3.isConnected()
Return true if the user has successfully connected with Pay3 Wallet, else returns false.
index.js
const isLoggedIn = pay3.isConnected();
const isLoggedIn = pay3.isConnected();
﻿
pay3.getAccount()
Returns wallet address of the connected wallet.  
index.js
const address = pay3.getAccount();
const address = pay3.getAccount();
﻿
pay3.getBalance({rpcURL [, tokenAddress]}) 
Returns logged in user's balance in the connected chain. It accepts an optional ERC20 Address in which case it returns user token address balance on the chain. The amount is returned is in WEI. 
Parameters
rpcUrl: You can pass your favourite rpcUrl that matches your dApp's chain. This URL is used for reading data from block chain from the JS sdk with in the dApp's / client application context.
tokenAddress (Type string, Optional): Address of any ERC20 token available on the connected chain. If tokenAddress is undefined the function returns coin balance of the connected user.
﻿
Get chain native coin balance
index.js
// Returns the native currency of the network held by the connected user. The returned value is in Wei 
const coinBalanceInWei = await pay3.getBalance({
          rpcURL: "https://your-rpc-url.com" });
// { BigNumber: "172334002436162568" }
// Returns the native currency of the network held by the connected user. The returned value is in Wei 
const coinBalanceInWei = await pay3.getBalance({
          rpcURL: "https://your-rpc-url.com" });
// { BigNumber: "172334002436162568" }
﻿
Get ERC20 token balance 
index.js
const USDC_ADDR = "0xB8c77482e45F1F44dE1745F52C74426C631bDD52";
const usdcBalanceInWei = await pay3.getBalance({
     tokenAddress: USDC_ADDR,
     rpcURL });
// { BigNumber: "172334002436162568" }


// To convert wei in ether use
import {ethers} from 'ethers';
const usdcBalanceInEth = ethers.utils.formatEther(usdcBalanceInWei)
// '0.172334002436162568
const USDC_ADDR = "0xB8c77482e45F1F44dE1745F52C74426C631bDD52";
const usdcBalanceInWei = await pay3.getBalance({
     tokenAddress: USDC_ADDR,
     rpcURL });
// { BigNumber: "172334002436162568" }


// To convert wei in ether use
import {ethers} from 'ethers';
const usdcBalanceInEth = ethers.utils.formatEther(usdcBalanceInWei)
// '0.172334002436162568
﻿
pay3.readContract({contractAddress, abi, functionName [, args]}, rpcURL)
Pay3 readContract is a helpful utility which accepts parameters for read functionality for any contract interaction deployed on blockchain. This uses the rpcUrl passed in the constructor to interact with blockchain.  
Parameters
Contract Details
contractAddress (string): Contract address deployed on the connected chain.
abi (Array of Objects):  ABI of the function that is being called.
functionName (string): Name of the function that need to be invoked. 
args (Array of Objects: Optional): List of arguments to be passed while invoking the function.
rpcUrl (string): You can pass your favourite rpcUrl that matches your dApp's chain.
index.js
import { erc20ABI } from 'wagmi';
const WMATIC_ADDRESS_MUMBAI = '0x9c3C9283D3e44854697Cd22D3Faa240Cfb032889';
const UNISWAP_ADDRESS_MUMBAI = '0x000000000022D473030F116dDEE9F6B43aC78BA3';
const rpcUrl = "https://rpc.ankr.com/polygon_mumbai";


// 1. Example of an ERC20 contract function call without arguments 
// Get Total Wrapped Matic Supply 
const data = await pay3.readContract({ 
  contractAddress: WMATIC_ADDRESS_MUMBAI, 
  abi: erc20ABI, 
  functionName: "totalSupply" 
}, rpcUrl);
console.log("Total Supply of WMatic: ", data.toString());


// 2. Example of an ERC20 contract function call with arguments
// Get Wrapped Matic allowance given by connected user to a Uniswap Contract on Polygon Mumbai testnet 
const ownerAddress = pay3.getAccount();
const spenderAddress = UNISWAP_ADDRESS_MUMBAI;

const data = await pay3.readContract({
  contractAddress: WMATIC_ADDRESS_MUMBAI,
  abi: ERC20ABI,
  functionName: "allowance",
  args: [ownerAddress, spenderAddress] 
}, rpcUrl);
console.log("Allowance given on WMatic to Uniswap: ", data.toString());
import { erc20ABI } from 'wagmi';
const WMATIC_ADDRESS_MUMBAI = '0x9c3C9283D3e44854697Cd22D3Faa240Cfb032889';
const UNISWAP_ADDRESS_MUMBAI = '0x000000000022D473030F116dDEE9F6B43aC78BA3';
const rpcUrl = "https://rpc.ankr.com/polygon_mumbai";


// 1. Example of an ERC20 contract function call without arguments 
// Get Total Wrapped Matic Supply 
const data = await pay3.readContract({ 
  contractAddress: WMATIC_ADDRESS_MUMBAI, 
  abi: erc20ABI, 
  functionName: "totalSupply" 
}, rpcUrl);
console.log("Total Supply of WMatic: ", data.toString());


// 2. Example of an ERC20 contract function call with arguments
// Get Wrapped Matic allowance given by connected user to a Uniswap Contract on Polygon Mumbai testnet 
const ownerAddress = pay3.getAccount();
const spenderAddress = UNISWAP_ADDRESS_MUMBAI;

const data = await pay3.readContract({
  contractAddress: WMATIC_ADDRESS_MUMBAI,
  abi: ERC20ABI,
  functionName: "allowance",
  args: [ownerAddress, spenderAddress] 
}, rpcUrl);
console.log("Allowance given on WMatic to Uniswap: ", data.toString());
﻿
pay3.disconnect()
Opens Pay3 Web Wallet and triggers logout for the user. Emits pay3-sdk-login-status event.
On completion of disconnect pay3-sdk-login-status﻿ ,event is published to the DApp.  
index.js
// Open Pay3 Modal and trigger logout
pay3.disconnect();
// Open Pay3 Modal and trigger logout
pay3.disconnect();
﻿
﻿
Updated 25 Mar 2024
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