Instead, I suggest exploring :

The speakers emitted a low, rhythmic pulse, like a digital mantra. A 16-digit code slowly materialized, glowing white against the black screen. He copied it, pasted it into the software, and held his breath.

: This appears to be a financial management system, likely designed for managing financial transactions, accounting, and possibly controlling cash flow (given that "Caixa" is Portuguese for "cash" or "box"). The version number, 4.0.1, suggests it is a specific iteration of the software, possibly with incremental updates.