OptionalinstitutionThe payment's network message ID, stored as institutionId on FedNow.
RTP_INBOUND is always "RTP". INSTANT_PAYMENT_INBOUND passes the detail's
network_type, which can be absent: then the network is unknown.
OptionalsenderOptionalsourceThe sender's account number. Only the webhook carries it.
OptionalsourceThe sender's routing number. Only the webhook carries it.
OptionalsuppliedText Victor gave the payment; it beats the generated description.
OptionaltchThe payment's network message ID, stored as tchInstitutionId on RTP.
Optionalvictor
What either Victor writer knows about one inbound instant payment. The webhook reads these off the event and the detail, the sync off the list item and the detail.