Transfer Money without knowing the account

Agent A and B are given 100 million dollar each. Agent A will go to a peaceful location. Agent B will be deputed in troublesome location for a covert operation. A needs to transfer B 1 million dollar every month on average. But the catch is, it needs to be online but B will not disclose his account number as it can be traced by enemies or proven in the court. How can you device a mechanism to do it ( No crypto currency)?

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