//Set platform apikey to paymaster
builder.setPaymasterOptions({
    apikey: apiKey,    //platform api-key
    rpc: payMasterRpc  //paymaster rpc
});

//Init client (parameters same as build)
const client = await Client.init(RPC_ENDPOINT, {
    overrideBundlerRpc: bundlerRpc,
    entryPoint: entryPointAddress,
});