Steps to integrate the package : 

    1. Create new relayer instance.
    2. Install the ethers package to create instance of your wallet.
    3. First prepare the data to be passed in Relayer instance.
    4. Pass the data to the processTxn method of Relayer instance.
    

    import Relayer from "relayer-sdk";
    import ethers from "ethers";

    const client = new Relayer({
        apiKey:"123",
    })

    randomWallet = <your wallet instance>                        // set up your wallet instance
    let walletNew = randomWallet.address                         // your wallet address

    let callData0 = "0x40c10f19000000000000000000000000" + walletNew.slice(2, 42) + "00000000000000000000000000000000000000000000001b1ae4d6e2ef500000"  // call data   to mint 500 tokens on gather network

    const data = {
    nonce: await token.nonces(walletNew),                                                           // create the token instance first to get nonce
    verifyingAddress: "0x7173228F7ae6c7e72BDB02c360072c1931426078",                  
    chainId: "356256156"
    }

    const message = await ethers.utils.solidityKeccak256(["uint256", "address", "uint256", "bytes"], [data.nonce, data.verifyingAddress, data.chainId, callData0])

    const messageHash = await ethers.utils.arrayify(message)

    const sig = await randomWallet.signMessage(messageHash);


    const params: any = {
        callData: callData0,
        signature: sig,
        message: message,
        payable: "0",
        userAddress: walletNew
    }

    client.processTxn(params).then(((response) => {
        
        console.log("response - ", response)
        
    }))