AppAnnie.rb

  def self.request(prev_day)

      @date = (Date.today - (prev_day)).strftime("%Y-%m-%d")

      parameters = [
        {
          account_id: 156021,
          'app_id' =>  "892559034",
          start_date: @date,
          end_date: @date
        }
        # {
        #   account_id: 186243,
        #   'app_id' => "co.good.android", MY QUESTION IS WHAT IS THE APP_ID FOR ANDROID? 
        #   start_date: @date,
        #   end_date: @date
        # }
      ]

      parameters.each do |p|
        data = AppAnnie::App.new(AppAnnie.accounts({}, @date).first, p).sales.first['units']['app']
        store data
      end

    end
    
  <------------------------------------------------------> 

module AppAnnie

  class << self

    attr_writer :api_key

    def api_key
      @api_key || ENV['APPANNIE_API_KEY']
    end

  end

  def self.accounts(options = {}, date)
    response = connection.get do |req|
      req.headers['Authorization'] = "Bearer #{api_key}"
      req.headers['Accept'] = 'application/json'
      req.url '/v1/accounts', options
    end

    if response.status == 200
      JSON.parse(response.body)['account_list'].map { |hash| Account.new(hash, date) }
    else
      ErrorResponse.raise_for(response)
    end
  end

  def self.connection
    @connection ||= Faraday.new url: 'https://api.appannie.com' do |faraday|
      faraday.adapter Faraday.default_adapter
    end
  end
  class App

    attr_reader :raw,
                :account,
                :id,
                :account_id,
                :status,
                :name,
                :start_date,
                :end_date,
                :icon

    def initialize(account, attributes)
      @raw        = attributes
      @account    = account
      @id         = attributes['app_id']
      @start_date = attributes[:start_date]
      @end_date   = attributes[:end_date]
    end

    def sales(options = {})
      response = AppAnnie.connection.get do |req|
        req.headers['Authorization'] = "Bearer #{AppAnnie.api_key}"
        req.headers['Accept'] = 'application/json'
        req.url "/v1/accounts/#{@account.id}/apps/#{@id}/sales?start_date=" + @start_date + "&end_date=" + @end_date
      end

      if response.status == 200
        JSON.parse(response.body)['sales_list']
      else
        ErrorResponse.raise_for(response)
      end
    end

  end

  class Account

    attr_reader :raw,
                :id,
                :name,
                :status,
                :platform,
                :start_date,
                :end_date,
                :publisher_name

    def initialize(attributes, date)
      @raw            = attributes
      @id             = attributes['account_id']
      @name           = attributes['account_name']
      @status         = attributes['account_status']
      @platform       = attributes['platform']
      @publisher_name = attributes['publisher_name']
      @start_date     = date
      @end_date       = date
    end

    def apps(options = {})
      response = AppAnnie.connection.get do |req|
        req.headers['Authorization'] = "Bearer #{AppAnnie.api_key}"
        req.headers['Accept'] = 'application/json'
        req.url "/v1/accounts/#{id}/apps", options
      end

      if response.status == 200
        JSON.parse(response.body)['app_list'].map { |hash| App.new(self, hash) }
      else
        ErrorResponse.raise_for(response)
      end
    end

    def sales(options = {})
      response = AppAnnie.connection.get do |req|
        req.headers['Authorization'] = "Bearer #{AppAnnie.api_key}"
        req.headers['Accept'] = 'application/json'
        req.url "/v1/accounts/#{id}/sales", options
      end

      if response.status == 200
        JSON.parse(response.body)['sales_list']
      else
        ErrorResponse.raise_for(response)
      end
    end

  end

end