Interchange Optimisation
What Is Interchange Optimisation? Definition and How It Works
Definition
Interchange optimisation is the practice of structuring payment transactions to qualify for the lowest available interchange rate categories, reducing the effective cost of card acceptance. It involves submitting transactions with the correct data fields, authentication status, and transaction type indicators to maximise qualification for preferential interchange tiers defined by card schemes for specific transaction profiles.
How it works
Card schemes publish interchange rate schedules with hundreds of categories differentiated by card type, merchant category, authentication method, data quality, and transaction channel. The published rates for a given card type can vary by a factor of 3 to 5 depending on which interchange category the transaction qualifies for. Interchange optimisation identifies and closes the gaps that prevent transactions from qualifying for the lowest applicable rate.
Key optimisation levers include: transaction data completeness (submitting all required fields in the authorisation and clearing messages, including AVS data, CVV status, and correct MCC); authentication status (transactions authenticated via 3DS2 qualify for lower interchange tiers than unauthenticated transactions in many schemes); settlement timing (transactions settled within the scheme's required window avoid downgrades to higher-cost categories); Level 2 and Level 3 data submission for commercial card transactions; and correct transaction type coding (card-present versus card-not-present, recurring versus instalment versus one-time).
Interchange downgrade occurs when a transaction fails to qualify for its expected rate tier due to missing data, late settlement, incorrect coding, or other deficiencies. Downgrades push the transaction into a higher interchange category, increasing the merchant's effective rate. Identifying and correcting downgrade patterns through authorisation and clearing data analysis is the practical work of interchange optimisation.
Network tokenisation also contributes to interchange optimisation: many card schemes assign lower interchange rates to transactions authenticated through a network token (with credential-on-file indicators) versus raw PAN transactions, reflecting the reduced fraud risk associated with tokenised credentials.
Why it matters
Interchange is the largest component of card acceptance cost for most merchants, typically representing 70% to 90% of the total cost under interchange-plus pricing. On significant transaction volumes, even modest optimisation produces material savings: a 0.1 percentage point reduction in effective interchange on $100M of card volume is $100,000 in annual savings.
Most merchants leave meaningful interchange savings uncaptured through suboptimal transaction data, avoidable downgrades, and missed Level 2/Level 3 qualification on commercial card volume. A thorough interchange analysis typically identifies 3 to 7 categories of improvable transactions, each addressable through specific data or process changes.
Interchange optimisation is distinct from rate negotiation: it does not involve changing the rates the scheme charges, but rather ensuring transactions qualify for the lowest rate tier already available for that transaction type. It is therefore applicable to merchants on interchange-plus pricing (where the actual interchange is passed through directly) and produces no benefit for merchants on blended pricing (where the merchant pays a fixed rate regardless of actual interchange).
With PXP
PXP supports interchange optimisation through complete data submission, correct authorisation coding, and network tokenisation. Talk to our team about how PXP can support your interchange optimisation.
Frequently asked questions
What causes an interchange downgrade?
Common downgrade triggers include: missing required data fields in the authorisation or clearing message (AVS data, CVV response code, or MCC); late settlement (transactions not settled within the scheme's required window after authorisation); incorrect transaction type coding (marking a recurring MIT as a one-time transaction); missing authentication data for transactions where 3DS is expected; and failing to submit Level 2 data for commercial card transactions that could qualify for enhanced data rates.
How is interchange optimisation different from negotiating a lower rate?
Negotiating a lower rate involves agreeing a lower overall pricing rate with the acquirer or PSP. Interchange optimisation is about ensuring each transaction qualifies for the lowest interchange rate already defined by the card scheme for that transaction type, without changing the underlying rate schedule. Optimisation produces savings by eliminating avoidable downgrades and maximising tier qualification. Both approaches can reduce total cost of acceptance but address different aspects of the cost structure.
Which merchants benefit most from interchange optimisation?
Merchants on interchange-plus or interchange-plus-plus pricing see the most direct benefit, because actual interchange costs are passed through and optimisation savings flow directly to the merchant. Merchants with high commercial card volumes (B2B merchants, government suppliers) benefit significantly from Level 2 and Level 3 data optimisation. High-volume consumer merchants benefit most from reducing downgrade rates. Merchants on blended pricing do not see direct per-transaction benefit from interchange optimisation.
Revolutionize your business with PXP
Take complete control of your commerce and payments with one platform.
Get Started