Map External Data Before It Enters Your Model

Sun, 01 Apr 2018 00:00:00 +0000

A payment callback arrives with these fields:

{
 "status": "COMPLETED",
 "amount": 7.79,
 "currency": "EUR",
 "reference": "session-demo-8",
 "transaction": "remote-demo-31",
 "message_time": "2026-04-01T09:15:00Z"
}

The application does not need a COMPLETED string or a floating-point amount. It needs a trusted result: which local operation completed, for how much, in which currency, under which remote identity, and at what instant.

Passing the decoded array into business code postpones that translation. It does not avoid it.

Authenticity comes before interpretation

The retained callback boundary receives a JSON string and a message authentication code. It rejects a missing or invalid code before the payment driver finalizes anything.

Mapping on Brian Faust

Map External Data Before It Enters Your Model

Authenticity comes before interpretation