Clearing

Clearing is the process of swapping transaction details between banks after authorisation, confirming exactly what's owed to whom before funds actually move during settlement. It happens behind the scenes on almost every card transaction, invisible to merchants and customers alike, which is part of why the gap between authorisation and funds actually showing up can seem confusing. Understanding clearing explains why an authorised sale doesn't automatically mean the money's already landed in a merchant's account.

What's Actually Happening in Clearing

Once a transaction's authorised, it isn't settled immediately. It enters clearing instead, where transaction details get exchanged and reconciled between the issuing and acquiring banks. Clearing confirms the final amounts owed across everyone involved before money actually moves anywhere.

How the Process Actually Runs

Authorised transactions get grouped and submitted for clearing at scheduled intervals rather than instantly, with the card network or clearing house reconciling what acquirers submitted against what issuers have on record. Once cleared, confirmed amounts move into settlement, where funds actually transfer.

Clearing and Settlement Aren't the Same Step

They get mentioned together constantly but represent different things: clearing confirms and reconciles what's owed, settlement is the actual transfer based on those confirmed figures. A transaction can be cleared without settlement having happened yet, particularly when there's a delay between the two.

Where Clearing Sits in the Bigger Picture

Clearing sits between authorisation and settlement in the transaction lifecycle, and knowing where it fits explains why authorised funds aren't always available right away. See the architecture of a payment gateway for how this stage connects to the rest of the flow.

What Actually Slows Clearing Down

Batch processing schedules, cross-border transactions needing extra currency conversion steps, discrepancies requiring manual reconciliation between acquirer and issuer. Merchants relying on fast access to funds should know their provider's actual clearing and settlement timelines rather than assuming funds land the moment a sale's authorised.

Cross-Border Adds Extra Steps Here Too

International transactions often add steps to clearing, since multiple clearing houses or correspondent banks can get involved reconciling a single cross-border payment. That's one reason these transactions typically settle slower than domestic ones, even when authorisation itself happened instantly.

Merchants Rarely See This Stage, and That's Fine

Clearing is one of the few parts of the payment chain most merchants never interact with directly, and that's largely by design. It's meant to run quietly and reliably in the background, with visibility only really mattering when something's gone wrong and a merchant needs to understand why funds haven't arrived yet.