What is Smart routing?
Algorithmic selection of an acquirer or MID per transaction to maximise approval rate, minimise cost, or both.
Smart routing is a core feature of payment orchestration that uses a dynamic, rules-based engine to select the optimal processing path for each individual transaction from a network of available acquirers or Merchant Identification Numbers (MIDs).
Instead of sending all transactions to a single default processor, the routing engine analyses each payment request in real-time against a set of merchant-defined criteria.
These criteria can include the card's issuing country, its BIN (Bank Identification Number), the card scheme (Visa, Mastercard, Amex), transaction currency, amount, and even the customer's risk score. The primary goals are typically to maximise authorisation rates, minimise processing costs, and reduce operational friction.
Mechanically, when a transaction is initiated, the smart routing engine intercepts the request before it is sent to any acquirer. It evaluates the transaction's properties against a Cascading list of rules.
For example, a rule might state: 'If currency is USD and card BIN is from the US, route to Acquirer A; otherwise, route to Acquirer B'.
The counterparties involved are the merchant's system, the routing engine (within an orchestration platform), and the multiple acquirers the merchant has accounts with.
A common nuance overlooked is the need for careful configuration and monitoring; poorly designed routing logic can lead to Reconciliation challenges or inadvertently concentrate volume in ways that breach acquirer risk thresholds, negating the intended benefits.
Worked example
A UK-based merchant sells high-ticket electronics globally and has two acquiring relationships:
- Acquirer A (UK): Offers low interchange for domestic cards but high cross-border fees.
- Acquirer B (EU): Has better rates for EU-issued cards.
Their smart routing logic is configured as follows:
- Rule 1: IF Card BIN Country is in ['DE', 'FR', 'ES'] AND Amount > €500, THEN Route to Acquirer B.
- Rule 2: IF Card BIN Country is 'GB', THEN Route to Acquirer A.
- Default: Route to Acquirer A.
A customer from Germany attempts a €1,200 purchase. The routing engine checks the transaction against the rules.
It matches Rule 1, sending the payment to the EU-based Acquirer B. This avoids Acquirer A's 1.5% cross-border fee, saving the merchant €18, and increases the likelihood of approval as it is processed by a more 'local' acquirer.
Without smart routing, this transaction would have defaulted to the more expensive and potentially lower-authorising UK acquirer.
Scheme notes
While smart routing is a merchant or orchestration-level strategy, it must operate within the bounds of scheme rules. For instance, routing can be used to manage chargeback ratios across multiple MIDs.
If one MID is approaching the threshold for a scheme monitoring programme like Visa's VDMP (100 disputes and 0.9% ratio), the routing logic can be adjusted to direct more 'safe' volume to that MID to lower its ratio, or divert riskier transactions elsewhere.
Additionally, schemes like Visa have rules around transaction integrity, so routing cannot be used to 'data-wash' or misrepresent the nature or origin of the transaction to an acquirer. The routing logic must always pass authentic and accurate transaction data.
Why it matters for merchants
Smart routing is one of the most powerful tools for optimising a merchant's payment performance. It directly impacts the bottom line by lowering costs through Least-cost routing, which selects the acquirer with the most favourable interchange and Scheme fee structure for each transaction.
It also drives top-line revenue by increasing approval rates; routing transactions to local acquirers can lift authorisations by several percentage points, preventing lost sales from unnecessary soft declines.
Cardflo's smart routing engine, a key part of our orchestration platform, allows merchants to easily build and manage these routing rules, ensuring every transaction has the highest probability of success at the lowest possible cost.
Frequently asked
How does smart routing specifically reduce the likelihood of false declines?
The logic identifies which acquirers have stronger relationships with specific issuing banks or higher success rates for particular Merchant Category Codes (MCCs).
By routing a transaction to an acquirer in the same legal jurisdiction as the issuer, the transaction is less likely to be flagged as high-risk by automated fraud filters.
Can smart routing be used to manage compliance with PSD2 and SCA?
Yes, routers can detect if a transaction falls within the scope of SCA based on the merchant and issuer location.
The system can then select a path that supports the necessary 3DS protocols or, conversely, routes the payment through an acquirer where specific exemptions are more likely to be accepted by the issuer.
What criteria can I use to build smart routing rules?
A flexible smart routing engine allows for numerous criteria. Common examples include card BIN country, currency, transaction amount, card type (debit, credit, prepaid), card scheme (Visa, Mastercard, Amex), and risk score.
You can also build rules based on product SKU or for retrying soft declines, such as routing a retry attempt to a different acquirer than the one that initially failed.
Will smart routing help if I only have one acquirer?
The primary benefits of smart routing are realised when you have multiple acquirers to choose from.
However, even with one acquirer, if you have multiple MIDs (for example, one for each currency), routing can be used to ensure transactions are processed on the correctly configured MID. This avoids currency conversion fees and potential declines from currency mismatches.
How does smart routing affect recurring payments or subscriptions?
This is a critical consideration. For subscriptions powered by tokenisation, the routing engine must be configured to consistently route subsequent recurring payments (CITs) to the same acquirer that processed the initial transaction (MIT).
This 'sticky MID' logic is essential because some acquirers may decline recurring charges if they did not process the original payment where the customer's consent was obtained. A good orchestration platform handles this automatically.
Can smart routing help me manage my chargeback rate?
Yes, this is an advanced use case. A merchant can use routing rules to manage volumes across different MIDs.
If one MID is approaching a scheme's chargeback threshold (e. g. , 0.9% ratio), you can configure the logic to direct lower-risk transactions to that MID. This increases its overall transaction count without a corresponding increase in disputes, thereby lowering its chargeback-to-sales ratio.
Is setting up smart routing a difficult technical project?
Historically, building this logic in-house was a major undertaking. However, modern payment orchestration platforms provide a user-friendly interface for building and managing these rules without writing code.
You can create a cascade of rules with simple 'if-then' logic, test them in a sandbox environment, and deploy them instantly. This makes sophisticated routing strategies accessible even to businesses without large engineering teams.
See how Smart routing plays out in practice
Industries and regions where this term drives real acquiring, routing, or dispute decisions.
Related terms
A platform layer that lets a merchant connect to multiple acquirers, APMs, and risk tools through one integration and route transactions intelligently.
A unique identifier issued by an acquirer that ties transactions to a specific merchant account.
An authorisation response refusing to fund a transaction, returned by the issuer with a reason code.
Related guides.
Ready to improve your payments setup?
Tell us about your business. We'll match you with the right acquiring partners and the right route, typically inside a week.