BIN routing
BIN routing optimises transaction success rates by directing payments based on the issuing bank's Bank Identification Number (BIN). Cardflo leverages BIN data to route transactions to the most suitable acquirer or MID.
This strategy reduces declines and optimises processing costs for specific card types or regions, enhancing overall payment efficiency.
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- Routing
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The overview
BIN routing is a sophisticated transaction steering method that uses the Bank Identification Number, the initial six to eight digits of a primary account number, to dictate the processing path.
Within the payments stack, the BIN identifies the issuer, card brand, currency, and country of origin. By analysing these attributes at the gateway or orchestration level, a merchant can direct a transaction to the acquirer most likely to grant authorisation.
This granular logic is commonly used to separate debit from credit, domestic from international, or prepaid from corporate cards. Regional acquirers often maintain higher approval rates for cards issued within their local jurisdictions.
Consequently, intelligent BIN-driven steering allows companies to minimise cross-border fees and reduce the occurrence of false declines due to perceived risk by international issuers.
It acts as a primary decision layer before the transaction reaches the scheme network, ensures adherence to specific card rules, and supports complex multi-MID configurations.
How it works
Initial BIN data extraction
When a cardholder enters their details at the checkout, the payment gateway or orchestration engine captures the first six to eight digits.
This sequence is compared against a comprehensive BIN database to identify critical attributes, such as the issuing bank, country, card tier, and the specific card scheme rules associated with the number.
Rule engine evaluation
The routing engine applies pre-determined logic based on the identified BIN attributes. For example, the system might check if the card is a local European debit card or an international business credit card.
This step ensures the transaction is categorised correctly before arriving at the merchant's configured routing table.
Acquirer selection and steering
Based on the internal rules, the transaction is steered to the specific acquirer or Merchant Identification Number (MID) best suited for that profile.
A domestic card may be sent to a local acquirer to avoid interchange surcharges, while a high-risk BIN might be sent to a specialist provider.
Authorisation and capture
The chosen acquirer submits the authorisation request to the issuing bank via the card scheme. By using the most compatible processing path, the merchant increases the probability of a successful response.
Once approved, the transaction proceeds to the standard capture and settlement stages within the payment lifecycle.
Why it matters
Optimising interchange and scheme fees
Transaction costs vary significantly based on the card type and the geographic location of the issuer relative to the acquirer. Directing cards to local acquirers ensures that transactions are processed as domestic, often qualifying for lower interchange caps under regulations such as PSD2.
This avoids the higher fees and currency conversion spreads typically associated with cross-border processing, directly impacting the net margin for high-volume merchants.
Improving global authorisation rates
Issuing banks often employ risk filters that are more stringent for transactions originating from foreign acquirers. By utilising BIN routing to match the card's country of origin with a regional acquirer, merchants can significantly reduce the volume of soft declines.
This approach fosters a more stable relationship with issuers, who are physiologically more inclined to authorise transactions that appear within their domestic or regional network.
Support for specialised card types
Certain acquirers have better technical support or more favourable pricing structures for specific card types, such as commercial, fleet, or prepaid cards. BIN routing allows a merchant to segregate these transactions automatically.
This ensure that complex data requirements, such as Level 2 or Level 3 purchase details, are handled by an acquirer capable of processing that metadata for lower rates.
Use cases
Multi-region e-commerce
A merchant selling across Europe and North America uses BIN routing to steer US-issued cards to a domestic US acquirer while directing EEA-issued cards to a European entity, avoiding international processing surcharges.
Subscription and recurring billing
A SaaS provider utilises BIN data to identify prepaid cards which may have a higher risk of dunning issues, routing them to specific gateways with enhanced retry logic or secondary authentication requirements.
High-ticket luxury retail
A retailer identifies high-tier platinum or infinite cards via the BIN to steer them towards acquirers that offer the highest authorisation thresholds and superior anti-fraud matching for high-value domestic settlements.
Marketplace payout management
A platform identifies the card type to ensure debit cards are prioritised for lower-cost processing, while credit transactions are steered to MIDs optimised for higher dispute management capabilities.
By the numbers
This represents the typical industry range for savings on interchange and cross-border fees when transitioning from a single-acquirer setup to a multi-acquirer BIN-optimised strategy.
Typical improvement observed by merchants when routing international transactions to local acquirers, thereby reducing issuer-side risk declines for cross-border traffic.
The standard duration added to the payment flow by a BIN lookup and routing decision, ensuring that intelligent steering does not negatively impact the checkout experience.
Related terms
Talk to our team about a live rollout on your acquiring stack.
What you get with BIN routing
- Identify issuing bank and country of origin using six or eight-digit BIN sequences.
- Categorise transactions by card product type including debit, credit, prepaid, or commercial tiers.
- Steer transactions to local acquirers to qualify for lower domestic interchange fee caps.
- Reduce cross-border transaction fees by matching issuer and acquirer regional jurisdictions.
- Minimise soft declines triggered by issuing bank legacy fraud detection systems on foreign transactions.
- Automate the segregation of corporate cards for Level 2 and Level 3 data processing.
- Support multi-MID strategies by distributing volume based on card brand or issuer performance.
- Direct high-risk BIN ranges to acquirers with specialised risk appetite or higher thresholds.
- Enable dynamic routing rules that adjust based on real-time acquirer availability or performance metrics.
- Analyse historical success rates by BIN to optimise the long-term routing table configuration.
A short scoping call, then a written plan for your MIDs.
Questions about BIN routing
How does BIN routing differ from standard dynamic routing?
Standard dynamic routing often relies on broad parameters such as transaction value, time of day, or merchant category code. BIN routing is more granular, focusing on the specific attributes of the card itself, such as the issuer's location and the card's technical capability.
While dynamic routing might split traffic for load balancing, BIN routing specifically aims to match the unique identity of the payment instrument with the acquirer most likely to offer the lowest cost and highest authorisation probability.
Will BIN routing assist with SCA and PSD2 compliance?
Yes, BIN routing allows merchants to identify cards issued within the European Economic Area (EEA) versus those issued in non-regulated regions. This enables the merchant to apply Strong Customer Authentication (SCA) triggers only where legally required by PSD2.
Proper BIN identification prevents the unnecessary friction of 3DS on transactions where the issuer is outside the scope of European regulation, thereby protecting the conversion rate for international shoppers.
Can BIN routing reduce fees for commercial or corporate cards?
Commercial and corporate cards often carry higher interchange rates. However, if these transactions are routed to acquirers that support Level 2 and Level 3 data processing, the merchant may qualify for lower interchange brackets.
BIN routing identifies these card types at the moment of entry, allowing the system to steer them to a specific MID that is technically configured to transmit the extra line-item data required by the schemes.
Is an eight-digit BIN required, or will six digits suffice?
The industry is currently transitioning from six-digit to eight-digit BINs due to the depletion of available number ranges. While six digits can still identify the major scheme and brand, eight-digit BINs provide the necessary granularity to identify specific sub-brands and issuing banks accurately.
Modern routing engines should support both to ensure that regional steering remains precise and that no transactions are misidentified during the industry-wide migration.
Does BIN routing affect the merchant's PCI-DSS scope?
If the BIN routing logic is handled by a PCI-compliant gateway or orchestration provider, the merchant's scope remains unchanged.
However, if the merchant targets the BIN data themselves on their own servers, they must ensure their environment is certified to handle the first six to eight digits of the PAN.
Most modern implementations use a vault or tokenisation system to perform BIN lookups without exposing the merchant to raw card data.
How can BIN routing lower the rate of failed recurring payments?
Subscription failures often occur when an issuer blocks a cross-border recurring charge. By using BIN routing to ensure that the Merchant Initiated Transaction (MIT) is processed through an acquirer in the same region as the issuer, the transaction appears less risky.
This increases the likelihood that the issuer's automated systems will approve the transaction without requiring manual intervention or step-up authentication from the cardholder.
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