You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: send_on_instagram_service.rb
    path of file: ./repos/chatwoot/app/services/instagram
    
    the code of the file until where you have to start completion: class Instagram::SendOnInstagramService < Base::SendOnChannelService
  include HTTParty

  pattr_initialize [:message!]

  base_uri 'https://graph.facebook.com/v11.0/me'

  private

  delegate 
    
  def merge_human_agent_tag(params)
    global_config = GlobalConfig.get('ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT')

    return params unless global_config['ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT']

    params[:messaging_type] = 'MESSAGE_TAG'
    params[:tag] = 'HUMAN_AGENT'
    params
  end