code: def rpc_get_account_balance(self, address, token_type, **con_info):
          
          if not check_account_address(address):
              return {'error': 'Invalid address', 'http_status': 400}
  
          if not check_token_type(token_type):
              return {'error': 'Invalid token type', 'http_status': 400}
  
          # must be b58
          if is_c32_address(address):
              address = c32ToB58(address)
  
          db = get_db_state(self.working_dir)
          account = db.get_account(address, token_type)
          if account is None:
              return self.success_response({'balance': 0})
  
          balance = db.get_account_balance(account)
          if balance is None:
              balance = 0
  
          db.close()
          return self.success_response({'balance': balance})
docs: Get the balance of an address for a particular token type
          Returns the value on success
          Returns 0 if the balance is 0, or if there is no address