State transfer from Polygon to Ethereum

[babyplutokurt]

Hello, I am wondering how to transfer data from child to Root, how to generate the proof as an input to receiveMessage() to receive the messages?
In the Doc of Polygon, it shows:
// npm i @maticnetwork/maticjs
// for goerli - mumbai testnet
const getPOSClient = (network = 'testnet', version = 'mumbai') => {
const posClient = new POSClient()
return posClient.init({
log: true,
network: network,
version: version,
child: {
"matic-provider"
},
parent: {
"matic-provider"
}
}
});
}
posClient.exitUtil.buildPayloadForExit("burntxhash","event signature")

I am wondering how to set "matic-provider", "matic-provider" and burntxhash, event signature

[DhairyaSethi]

You can find an example implementation of initialising maticjs here
Documentation for reference.