Xero, an accounting software provider listed on the ASX, has seen a surge in revenue but a drop in full-year profits due to the integration of Melio, its US payments acquisition. The New Zealand-founded company reported earnings for the 12 months ending March. The results come after a difficult week for the company, which is dealing with allegations against founder Sir Rod Drury. Xero chief executive Sukhinder Singh Cassidy sent an email to customers this week apologising for a technical outage.