/**
* Applies to specified Bf_Subscription: a coupon by a specified code.
* @param string The Coupon code to apply.
* @param union[string $id | Bf_Subscription $subscription] The Bf_Subscription to which the Bf_Coupon should be applied. <string>: ID of the Bf_Subscription. <Bf_Subscription>: The Bf_Subscription.
* @return Bf_Coupon The applied coupon.
*/
public static function applyCouponCodeToSubscription($couponCode, $subscription)
{
return Bf_AddCouponCodeRequest::applyCouponCodeToSubscription($couponCode, $subscription);
}