If a client must resort to a credit card for a large purchase due to tight cash flow, do not pass on the 2-3% processing fee. Absorbing this cost is a small price to pay to secure the deal and proves you're 'in it together' during difficult financial times.

Toast monetizes payments at a 49 basis point take rate, roughly half of what competitors like Square charge. This significant gap represents a major, underappreciated lever for future gross profit growth as the company scales, without needing to increase prices for its core software subscription.

By encouraging users to save low-cost payment methods (like bank accounts), Stripe's Link product effectively creates a distributed, techno-social renegotiation of interchange fees. It gives millions of small businesses the collective bargaining power that only giants like Walmart traditionally wield against payment networks.

Shipt identified markups, fees, and tips as a key driver of churn. Since tips and some fees were unavoidable, they strategically focused on eliminating markups—the one component of the cost structure they could directly control—to create a powerful competitive advantage.

Unlike giants like Adyen or Fiserv, Shift4 focuses on deep integration within specific verticals like restaurants, hotels, and stadiums. They are the number two US restaurant POS and process payments for 75% of professional sporting venues, creating a strong moat.

Counterintuitively, Visa grows by introducing premium cards with higher merchant fees. These higher fees fund larger rewards, making the cards more attractive for issuing banks to promote and for affluent consumers to use. This strategy allows Visa to effectively capture market share through higher prices.

Shift4's core strategy involves acquiring legacy, on-premise POS software companies. By attaching its payment processing services to this existing merchant base, it can increase the revenue from each location by roughly 10x, turning "shops on gold" with minimal initial software revenue.

The bear case that Shift4's growth will stall as it runs out of legacy POS systems to convert is flawed. In reality, over 80% of new Shift4Dime POS installs are entirely new merchants to the ecosystem, not migrations from older, acquired software platforms.

The system of charging retailers an interchange fee (around 1.8%) that is then passed to consumers as rewards (around 1.57%) creates a strong network effect. Consumers are incentivized to use rewards cards, and retailers cannot easily offer discounts for other payment methods, locking both parties into the ecosystem.