Features
Strictly as-of listing
Every input is computed from events dated before the account's own listing date: prior journeys, prior payments, response ratios by channel, sibling accounts placed or paid. Nothing that happened after listing leaks in.

Validate
Grouped and exposure-controlled
Accounts of the same consumer never appear in both training and test folds. Only accounts with 12 months since listing are scored, and the result is confirmed on a fixed 12-month outcome window (0.745 against 0.716).

Deploy
Combine or replace
The incumbent and consumer-history scores disagree exactly where each holds information the other lacks, which keeps a combined score on the table. That decision is made with the provider, against its clients' expectations.