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: partner_request_recertification_service.rb
    path of file: ./repos/human-essentials/app/services
    
    the code of the file until where you have to start completion: class PartnerRequestRecertificationService
  include ServiceObjectErrorsMixin

  # Creates a new instance of PartnerRequestRecertificationService
  #
  # @param partner: [Partner] the partner record
  #
  # @return [PartnerRequestRecertificationService]
  def initialize(partner:)
    @partne
    
  def call
    return self unless valid?

    Partners::Base.transaction do
      partner.recertification_required!
      PartnerMailer.recertification_request(partner: partner).deliver_later
    rescue StandardError => e
      errors.add(:base, e.message)
      raise ActiveRecord::Rollback
    end

    self
  end