I am not sure that anything governs the cancellation of such a service. It truly would be highly unusual on a wholesale level. You need to involve legal counsel as you need to make sure you do everything reasonably possible to notify customers with enough lead time that this services is being cancelled. The bank not making one of these transfers on a timely basis might turn out to be really expensive for a customer. Like you fail to properly notify a customer that the transfer is no longer going to be made, you don't send a life insurance payment and your customer dies.
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