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# Glossary

> Definitions for terms that apply across the CrissCross Payments, Exchange, and Payouts APIs.

Terms that apply across the whole platform. For terms specific to one product, see its own glossary: [Exchange](/exchange-glossary), [Collect](/collect-glossary), [Payouts](/payouts-glossary).

* **Compliance screening** — sanctions, AML, and fraud checks that confirm a payment or recipient is legitimate and cleared to proceed.
* **Fiat** — government-issued currency (e.g. USD, NGN, KES), as opposed to a stablecoin.
* **Idempotency / Idempotency-Key** — a unique key attached to a request that lets the server recognise a repeat of the same request and perform the action only once; a retry carrying the same key returns the original result instead of acting again. See [Conventions](/conventions).
* **Merchant of Record (MoR)** — the entity legally responsible for a payment: the seller on record to payment providers, tax authorities, and regulators, accountable for processing, tax, and compliance.
* **Merchant reference** — a merchant-supplied identifier attached to a session, transaction, or payout, used for tracking and reconciliation.
* **Minor units** — an amount expressed as an integer in the currency's smallest unit (e.g. `10000` = 100.00 NGN). See [Conventions](/conventions).
* **Processor (PSP)** — a payment service provider that processes a payment on its underlying rail.
* **Rail** — the underlying channel a payment moves over (card, bank transfer, mobile money, stablecoin).
* **Reconciliation** — matching records from different systems (e.g. provider statements and an internal ledger) to confirm they agree.
* **Routing / failover** — selecting the best processor for each payment, and automatically switching to another if one is unavailable or fails.
* **Stablecoin** — a crypto asset pegged to a fiat value (e.g. USDT, USDC).
* **Webhook** — a server-to-server HTTP POST that notifies a registered endpoint of an event (a state change), signed and retried on failure.