#### PREREQUISITES ####

• Ruby 1.9.3 or above.

• Read API documentation (https://latch.telefonica.com/www/developers/doc_api).

• To get the "Application ID" and "Secret", (fundamental values for integrating Latch in any application), it’s necessary to register a developer account in Latch's website: https://latch.telefonica.com. On the upper right side, click on "Developer area".

• Require "Latch". Keep in mind where the SDK is placed inside your folder structure.

	require_relative '/latch/Latch'

• Create a Latch object with the "Application ID" and "Secret" previously obtained.

	api = Latch.new(appid, app_secret)

• Call to Latch Server. Pairing will return an account id that you should store for future api calls

     pairResponse = api.pair(PAIRING_CODE_HERE)
     statusResponse = api.status(ACCOUNT_ID_HERE)
     unpairResponse = api.unpair(ACCOUNT_ID_HERE)

• After every API call, get Latch response data and errors and handle them.

	responseData = response.data
	responseError = response.error

For using the Ruby SDK within an Web3 service, you must complain with the following:

• It is necessary to have a developer subscription that allows you to create web3 apps.
• You need metamask extension for Google Chrome Download metamask
• You need a wallet to operate on Polygon. You can easily create one through Metamask.

Once you have your developer Latch account created, you must logging in the website.

Steps to add new web3 app in latch-website

We add a new method to pair the web3 applications, now we have two new parameters. The two additional parameters are:

• WEB3WALLET: The Ethereum-based address wallet for the user that wants to pair the service.
• WEB3SIGNATURE: A proof-of-ownership signature of a constant, in order to verify that the user owns the private key of the wallet. You can use https://etherscan.io/verifiedSignatures# to sign the following message:
  • MESSAGE TO SIGN : "Latch-Web3"

• Call to Latch Server for pairing as usual, but with the newly methods:

    api = latch.Latch(APP_ID, SECRET_KEY)
    # PAIR
    response = api.pair(pairing_code, WEB3WALLET, WEB3SIGNATURE)

You have an example of use in the file example for web3 app