Concepts

The entities Core exposes — ledger, cards, spending controls, payouts, and FX rates.

Core's API is built around five entities. Each one has its own data model, lifecycle, and webhooks. Understanding them in isolation is the prerequisite for combining them in a flow.

Collecting money into subaccounts is a whole sub-area of its own — Payins — nested in this section with its own concept pages and methods; its flows and webhooks live in Core's Flows and Webhooks sections.

Cards

Virtual and physical cards that spend against ledger accounts.

FX rates

Reference rates and conversion mechanics for multi-currency ledgers.

Ledger

Double-entry bookkeeping for accounts, transactions, holds, and settlements.

Payins

Money in — templates, intents, payins, and settlement batches.

Payouts

Money out — to internal accounts or external destinations.

Spending controls

Real-time rules that limit what a card can do.