gistfile1.rb

if transaction.errors.empty?
      # Processa a notificação. A melhor maneira de se fazer isso é realizar
      # o processamento em background. Uma boa alternativa para isso é a
      # biblioteca Sidekiq.
      @payment = Payment.find[transaction.reference.gsub("DW", "")]
      PagseguroMailer.welcome(payment).deliver

      PaseguroMailer.welcome(@payment).deliver
      p transaction
      if @payment.present? and @payment.awainting? and @payment.value == transaction.gross_amount and transaction.code == 3
        ActiveRecord::Base.transaction do
          @payment.approved!
          @payment.approved_at = Date.current

          @payment.histories.build(status: PaymentStatus::approved)
          @payment.save

          @establishment = Establishment.find(@payment.establishment)
          @establishment.plan = @product.plan
          @establishment.due_date = Date.current + 1.year
          @establishment.save
        end
      end
    end