Another bad service object day

bad_service_2.rb

class UserSubscriberService
  PROMO_DISCOUNT_PERCENT = Rational(85, 100) # 15% OFF

  PREMIUM_PLAN_NAME = 'premium_plan'

  def self.call(user)
    plan = Plan.find_by(name: PREMIUM_PLAN_NAME)
    user.build_subscription
    user.subscription.plan = plan
    user.subscription.amount = plan.amount * PROMO_DISCOUNT_PERCENT
    user.subscription.cadence_months = plan.cadence_months
    unless user.subscription.save
      return Result.new(:failure, "could not create subscription")
    end

    payment = subscription.payments.create(source: user.payment_card)
    result = PaymentGateway.charge_payment!(payment)
    if result.success?
      user.subscription.status = 'active'
      user.subscription.started_ = Time.now
      user.subscription.save
      
      user.account.increment!(:credit_balance, plan.monthly_credits)
      return Result.new(:success)
    else
      return Result.new(:failure, "could not charge payment")
    end
  end
end