Module 3

Pricing and Unit Economics

How to model your true cost of payments, optimise interchange, and know when to migrate to direct acquiring

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The True Cost of Accepting Payments

Most organisations have no idea what they actually spend on payments. They know their per-transaction fee percentage. They do not know the true cost when you add in gateway fees, fraud detection, compliance overhead, reconciliation tools, and the labour cost of payment operations. This module teaches you to calculate the true cost and use that to drive strategic decisions.

Payment costs are often the second or third largest cost category after people and infrastructure. For ecommerce, payments can be 2 to 4 percent of revenue. For marketplaces, it can be 5 to 10 percent. Understanding this cost structure is the foundation for any negotiation with processors or decision to build your own infrastructure.

You cannot optimise what you do not measure. Most organisations optimise their payment stack by accident rather than design. They choose vendors based on sales relationships, then spend years overpaying because they never measured their true cost or understood what they were getting for their money.

The Payment Cost Stack

Your payment cost stack has multiple layers. Understanding each layer is critical for identifying optimisation opportunities.

• Interchange fees: The largest component for card transactions. Set by card networks (Visa, Mastercard), not negotiable individually. Interchange rates vary by card type (credit vs. debit, domestic vs. international) and by transaction qualification (Level 2/3 data optimization). A typical interchange rate for e-commerce is 1.0 to 2.0 percent for domestic credit cards. International cards are higher (2.0 to 3.5 percent).
• Network assessments: Fees charged by Visa and Mastercard. Typically 0.05 to 0.15 percent of transaction value. These are set by the networks, not negotiable.
• Processor markup: The processor's profit margin on top of interchange and assessments. Typically 0.3 to 1.0 percent. This is where you negotiate.
• Gateway fees: Fees charged by the gateway (Stripe, Adyen, Square). Typically bundled into the per-transaction rate but sometimes charged separately. Can be 0.3 to 1.5 percent depending on the gateway.
• Fraud and risk services: Fraud detection, chargeback management, and risk scoring. Can be 0.05 to 0.5 percent depending on the service.
• Other variable costs: Batch fees, exception fees, PCI compliance fees, settlement fees. Typically 0.1 to 0.3 percent combined.
• Fixed costs: Monthly gateway fees, monthly monitoring subscriptions, annual compliance certifications. Can be $500 to $50,000 per month depending on your transaction volume and complexity.

Adding these up, a typical effective rate for a mid-market ecommerce business is 2.5 to 3.5 percent. For marketplaces, it is higher: 3.0 to 4.5 percent. Your effective rate depends on your transaction mix, geographic distribution, and negotiating leverage.

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Interchange Optimisation Strategies

Interchange is the largest component of payment costs and the only place where you have significant leverage. Interchange rates are set by card networks, but your effective interchange depends on transaction qualification. Better transaction qualification leads to lower interchange rates. Worse qualification leads to higher rates.

Level 2 and Level 3 Data

Card networks reward transactions that include additional data beyond the basic card number, amount, and merchant ID. Transactions with more data are "better qualified" and qualify for lower interchange rates.

Level 2 data includes purchase order number, tax amount, customer VAT number, and line item counts. Level 2 qualification typically reduces interchange by 0.1 to 0.3 percent. This matters for B2B transactions.

Level 3 data includes detailed line items: product codes, quantities, unit prices, freight, and duty. Level 3 qualification typically reduces interchange by 0.2 to 0.5 percent. This is primarily for corporate card programs.

The catch: capturing and sending Level 2/3 data requires engineering work. Your payment integration has to capture tax, shipping, and item-level details, then pass them to the processor in the correct format. The payback period depends on your transaction volume. If you process $100,000 monthly in B2B transactions, a 0.3 percent reduction in interchange saves $300 monthly, or $3,600 annually. That justifies 4 to 6 weeks of engineering work to implement Level 2 data.

Network Tokenisation and Recurring Transaction Uplift

Network tokenisation is when the card network issues a unique token representing the customer's card. This token can be used for repeat transactions and qualifies for lower interchange rates than standard transactions.

Recurring transactions (subscriptions, monthly billing) with network tokens typically qualify for interchange rates 0.1 to 0.3 percent lower than non-recurring transactions. If you process $500,000 monthly in recurring transactions and can move 80 percent to network token, that is a 0.2 percent reduction on $400,000 = $800 monthly savings, or $9,600 annually.

Network tokenisation requires processor support and customer consent (recurring transaction agreements). Most modern processors support this, but you need to explicitly request it.

Debit Routing and Durbin Optimization

The Durbin Amendment caps debit card interchange for certain issuers at $0.21 to $0.25 per transaction (much lower than typical 1 to 2 percent). Some processors have access to lower-cost debit networks (PIN debit, regional debit networks) that bypass high interchange.

If 30 percent of your transactions are debit cards, this matters. You can potentially reduce your effective rate by 0.3 to 0.8 percent by routing debit transactions through lower-cost networks. The catch is that lower-cost networks require PIN entry, which changes your user experience. For online commerce, this is usually not viable. For in-person or POS transactions, it is standard.

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Blended vs. Interchange-Plus Pricing

Payment processors offer two primary pricing models: blended and interchange-plus. Understanding the difference is critical for calculating your true cost and for negotiations.

Blended Pricing

Blended pricing is a single percentage rate (typically 2.5 to 3.5 percent) that the processor charges for all transactions. The processor absorbs the difference between your blended rate and actual interchange costs. Blended pricing is simple and predictable for the merchant, but it obscures the true cost and gives the processor huge margin variability.

Blended is designed to benefit customers with predictable transaction profiles. A business with uniform transaction mix across geographies and card types will pay a fair rate. A business with high interchange transactions (international, corporate cards) will overpay. A business with low interchange transactions (debit, domestic) will underpay.

At low volume, blended makes sense. You do not have negotiating leverage to get interchange-plus, so you accept a blended rate. At high volume, blended is a tax. You are leaving money on the table by not understanding your actual interchange.

Interchange-Plus Pricing

Interchange-plus (IC+) pricing separates costs into three layers: interchange (pass-through, set by card networks), assessments (pass-through, set by card networks), and processor markup (where you negotiate).

An IC+ quote might look like: Interchange (varies by transaction type) plus 0.45 percent processor markup plus $0.10 per transaction. For a domestic credit card transaction, interchange is 1.5 percent, so the total is 1.5 percent plus 0.45 percent plus $0.10 = 1.95 percent plus $0.10. For an international corporate card, interchange might be 2.5 percent, so total is 2.5 percent plus 0.45 percent plus $0.10 = 2.95 percent plus $0.10.

IC+ is more transparent but requires you to understand interchange complexity. Most organisations do not, so processors offer blended as a simpler alternative. Once you have enough volume to negotiate IC+, the transparency helps you identify optimisation opportunities (Level 2/3 data, network tokenisation, debit routing).

Blended vs. IC+ Breakeven Analysis

When does it make sense to migrate from blended to IC+? Calculate the breakeven point. If your current blended rate is 2.8 percent and you can get IC+ at 0.5 percent processor markup plus interchange pass-through, you need to know your actual interchange costs to determine if IC+ is better.

If your average interchange is 1.5 percent (because you are mostly domestic credit cards), IC+ would be 1.5 percent plus 0.5 percent plus $0.10 = 2.0 percent plus $0.10 per transaction. This is cheaper than 2.8 percent blended. If your average interchange is 2.0 percent (because you have high international volume), IC+ would be 2.0 percent plus 0.5 percent plus $0.10 = 2.5 percent plus $0.10. This is also cheaper than 2.8 percent blended.

The key is knowing your actual interchange costs. This requires access to processor reports that break down transactions by interchange category. Most processors provide this. If your processor does not, ask for it. This data is table stakes for understanding your cost structure.

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The $5M to $50M Transition: From PayFac to Direct Acquiring

Most fast-growing payments businesses follow a predictable path: start with a managed PSP (PayPal, Stripe), move to a payment facilitator (PayFac) as volume increases, then eventually move to direct acquiring with an acquirer when volume justifies it.

Why the Migration Happens

At low volume (under $5 million annually), managed PSPs make sense. You pay higher fees (2.5 to 3.5 percent), but you avoid operational complexity. As you scale to $5 to $50 million, PayFacs become attractive. A PayFac operates under an acquiring licence, allowing merchants to sub-merchant under the PayFac's licence. You negotiate lower rates with the PayFac (1.8 to 2.8 percent typically), but you take on more operational responsibility.

At $50 million plus, direct acquiring makes sense. You negotiate directly with an acquirer (a bank or processor like Worldpay, Global Payments, Fiserv) for rates that reflect your volume and mix (1.0 to 1.8 percent typically). You maintain your own acquiring licence and assume full operational responsibility for compliance, reconciliation, fraud management, and chargebacks.

What Changes When You Migrate

Migrating from PayFac to direct acquiring requires significant operational changes:

• Compliance burden increases dramatically: With a PayFac, compliance is shared. With direct acquiring, you own compliance. You need annual third-party audits, you maintain PCI compliance, you handle regulatory reviews. Budget $50,000 to $200,000 annually for compliance depending on your complexity.
• Settlement complexity increases: PayFacs handle settlement to a single account. Direct acquirers require you to manage settlement across multiple acquiring regions, settlement in multiple currencies, and complex reconciliation. You need automated settlement accounting.
• Fraud and chargeback management becomes your responsibility: You manage fraud prevention, dispute handling, and chargeback management directly with the acquirer. This requires dedicated personnel and potentially third-party fraud services.
• Integration complexity increases: You are no longer integrating with a single PSP. You are integrating with multiple acquiring partners, each with different APIs, settlement formats, and requirements.
• Operational overhead increases: You need dedicated payments operations staff to manage processor relationships, monitor performance, reconcile settlements, and handle exceptions.

When It Makes Economic Sense

The migration is economically justified when the fee savings exceed the operational overhead. If you are processing $50 million annually at 2.5 percent with a PayFac, that is $1.25 million in fees. If you can negotiate direct acquiring at 1.4 percent, that is $700,000 in fees, a savings of $550,000 annually. If the operational overhead (salaries, compliance, tools, legal) is $200,000 annually, the net savings is $350,000. The payback period is under 6 months. For a business with that volume, it makes sense to migrate.

If you are processing $10 million annually, the fee savings would be $110,000 (from 2.5 percent to 1.4 percent). If operational overhead is $150,000 annually, you are losing money. The migration does not make sense until your volume is higher or your current PayFac fees are higher.

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Negotiating with Acquirers: What Is and Is Not Negotiable

Acquirer pricing appears complex. The reality is simpler: some elements are negotiable, most are not. Understanding the difference helps you focus negotiations on what matters.

Not Negotiable

• Interchange: Set by card networks, not negotiable with the acquirer. Your acquirer does not control interchange.
• Network assessments: Set by Visa and Mastercard, not negotiable.
• Scheme fees: Set by the networks, passed through by the acquirer. Not negotiable, though they do change (historically April and October).
• Data network fees: For certain transaction types, data networks charge fees. Not negotiable.

Negotiable

• Processor markup: The acquirer's profit margin on top of interchange and fees. This is where you negotiate. For large merchants (over $50 million volume), markup can be negotiated from 0.5 percent down to 0.15 percent. For smaller merchants, you have less leverage.
• Per-transaction fees: Some acquirers charge per-transaction fees (e.g., $0.25 per transaction). These are negotiable, especially if you commit to volume.
• Monthly minimums: Some acquirers require monthly minimums. These are negotiable or can be waived for commitments.
• Volume commitments and discounts: If you commit to volume over time (e.g., "$100 million annually for the next 3 years"), you can negotiate lower rates.
• Settlement terms: Settlement timing (1-day, 2-day, or longer) and funding frequency can be negotiated. Faster settlement comes at a cost.
• Contract length and flexibility: 36-month contracts can be negotiated down to 12 months or made monthly. Early termination fees can be reduced or eliminated.

Negotiation Strategy

Successful negotiations follow a pattern. First, get multiple quotes from different acquirers. You need competitive pressure. Get quotes that break down all components (interchange pass-through, processor markup, per-transaction fees, minimums). Compare apples-to-apples. Then take your best quote and use it as leverage with other acquirers. Tell them: "Competitor X offered this. Can you match or beat it?"

Second, understand your leverage. Your leverage is your volume and your growth trajectory. If you are processing $100 million annually and growing 50 percent per year, you have leverage. If you are processing $5 million with flat growth, you have less leverage. Use your leverage to negotiate processor markup, not interchange.

Third, commit to volume commitments if they help. If you commit to $200 million over the next 3 years and the acquirer reduces your markup by 0.2 percent, that is $400,000 in savings. Worth committing to. But only commit to growth you are confident about.

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The Hidden Costs Most Businesses Miss

Beyond per-transaction fees, there are systematic costs that most organisations ignore until they bite.

Scheme Fee Increases

Visa and Mastercard increase their assessment fees twice per year, typically in April and October. The increase is usually 1 to 5 basis points. This does not sound like much, but at scale it compounds. A 3-basis-point increase on $500 million in annual volume is $150,000. If your organisation does not budget for this, you are surprised by margin compression.

FX Markup on Cross-Border Transactions

When you process international transactions, you need to convert currencies. The processor handles this conversion and charges a markup. The markup is typically 1.5 to 3 percent on top of the interbank FX rate. This can be negotiated, but it is often overlooked.

If 20 percent of your transaction volume is international and you process $50 million annually, that is $10 million in cross-border volume. A 2 percent FX markup is $200,000 per year. With volume, you can negotiate this down to 1 percent, saving $100,000 annually.

PCI Compliance Costs

PCI compliance is expensive. If you are out of scope (using a processor that handles all card data), your cost is minimal. If you are in scope, you need annual third-party audits (typically $10,000 to $50,000), security tools and infrastructure ($5,000 to $20,000 annually), and ongoing training and monitoring. Total PCI compliance cost for a business in scope can be $30,000 to $100,000 annually.

This is one reason to prefer processors that reduce your PCI scope. A processor that does full tokenisation can move you to SAQ-A (no audit required), saving significant compliance costs.

Chargeback Overhead

Chargebacks are expensive. Each chargeback costs 0.1 to 0.3 percent of the transaction value (the chargeback fee) plus the cost of disputing it. If you have a 1 percent chargeback rate on $50 million in volume, that is $500,000 in chargebacks plus $50,000 to $150,000 in dispute handling costs. Total: $550,000 to $650,000 per year.

Reducing your chargeback rate by 0.5 percent saves $250,000 to $325,000 annually. This is why fraud and risk prevention tools matter. Their cost is justified if they reduce chargebacks.

Reconciliation Labour

If your payment reconciliation is manual or semi-automated, it consumes significant labour. If one person spends 40 percent of their time on reconciliation, that is roughly $30,000 annually in loaded cost. If your organisation has 5 people doing payment operations, and 30 percent of their time is reconciliation, that is $135,000 annually. Automating reconciliation could save this cost.

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Building a Payments P&L and Presenting to the CFO

Finance teams care about margin. Every percent of cost that you can reduce flows through to margin. Building a clear payments P&L helps you communicate the value of optimisation investments to your CFO.

P&L Structure

A payments P&L should be structured like this:

This P&L shows the CFO the true cost of payments. It also shows where optimisation matters. If you can reduce FX markup from 2 percent to 1 percent, that is $1 million in savings. If you can reduce your chargeback rate from 1.2 percent to 0.8 percent, that is $2 million in savings. These are material improvements worth investing in.

Present this to your CFO as "payment economics" not as a tech problem. Show the P&L, show the benchmark against peers, and show specific optimisation opportunities with payback periods. Most CFOs will fund investments that have clear ROI and reasonable payback periods.