I am enquiring about notifications for [transfer channel]. Please explain separately which events trigger messages to the payer and to the recipient, through which channels, and whether the intended recipient must first agree to receive notifications. If a message does not arrive, how can the actual transaction status be checked with the original provider? I am not providing real contact details or changing settings. I do not equate sending a message with it being read, or treat a notification as proof that funds have arrived or cash is available for collection.