plaid_demo.rb

require 'httparty'
require 'awesome_print'

public_token = ""

class PlaidAdapter
  CLIENT_ID = ''
  CLIENT_SECRET = ''

  attr_reader :public_token

  def initialize(public_token)
    @public_token = public_token
  end

  def access_token
    @access_token ||= begin
      body = { 
        client_id: CLIENT_ID,
        secret: CLIENT_SECRET,
        public_token: public_token 
      }
      HTTParty.post("https://tartan.plaid.com/exchange_token", body: body)["access_token"]
    end
  end

  def transactions(account: nil)
    body = { 
      client_id: CLIENT_ID,
      secret: CLIENT_SECRET,
      access_token: access_token 
    }

    body.merge!(options: { account: account} ) if account
    HTTParty.post("https://tartan.plaid.com/connect/get", body: body)
  end

  def upgrade(product: "auth") # if you got a token for the auth product instead of connect
    body = { 
      client_id: CLIENT_ID,
      secret: CLIENT_SECRET,
      access_token: access_token,
      upgrade_to: product
    }
    HTTParty.post("https://tartan.plaid.com/upgrade", body: body)
  end

  def auth_data
    body = { 
      client_id: CLIENT_ID,
      secret: CLIENT_SECRET,
      access_token: access_token,
    }

    HTTParty.post("https://tartan.plaid.com/auth/get", body: body)
  end
end