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# Assume that you have already defined your domain entities and domain services. # Domain entities class Account: def __init__(self, account_id, balance): self.account_id = account_id self.balance = balance def deposit(self, amount): self.balance += amount def withdraw(self, amount): if self.balance >= amount: self.balance -= amount return True return False # Domain services class AccountRepository: def __init__(self): self.accounts = {} def get_account_by_id(self, account_id): return self.accounts.get(account_id) def save_account(self, account): self.accounts[account.account_id] = account # Application service class TransferService: def __init__(self, account_repository): self.account_repository = account_repository def transfer_money(self, source_account_id, target_account_id, amount): source_account = self.account_repository.get_account_by_id(source_account_id) target_account = self.account_repository.get_account_by_id(target_account_id) if not source_account or not target_account: return "Invalid account IDs." if source_account.withdraw(amount): target_account.deposit(amount) self.account_repository.save_account(source_account) self.account_repository.save_account(target_account) return "Money transferred successfully." else: return "Insufficient balance for the transfer."