/**
  * @return CouponResponse
  */
 protected function createCoupon()
 {
     $duration = 'once';
     $percentOff = 50;
     $request = $this->coupons->createCouponRequest($duration)->setPercentOff($percentOff);
     return $this->coupons->createCoupon($request);
 }
 protected function tearDown()
 {
     $this->customers->deleteCustomer($this->customerId);
     $this->coupons->deleteCoupon($this->couponId);
     $this->plans->deletePlan($this->planId);
     parent::tearDown();
 }