gistfile1.rb

# /app/models.order.rb

def sell_users_coins
  begin
    client = user.create_client
    balance = user.balance(client)
    
    # some code related to selling the actual bitcoins
    # logic, edge case checks, etc.
    
  rescue Coinbase::Error => e
      if e.message == "You don't have that many bitcoins in your account to sell."
        # do some stuff
      end
  ensure
    user.update_credentials(client)
  end
end