public void RecommendAFriend(int referrerId, NewAccount friend)
 {
     // ...
 }
 public void ReferAFriendWithoutLoyaltyBonus(int referrerId, NewAccount friend)
 {
     // ...
 }
 public void RecommendAFriendInDifferentCountry(int referrerId, NewAccount friend)
 {
     // ...
 }
 public void ReferAFriendWithoutLoyaltyBonus(int referrerId, NewAccount friend)
 {
     // ...
 }
 public void RecommendAFriendInDifferentCountry(int referrerId, NewAccount friend)
 {
     // ...
 }
 public void RecommendAFriend(int referrerId, NewAccount friend)
 {
     // ...
 }