Why this matters
Every "cash only" or "card machine is down" moment is a sale you worked to attract and then refused. Card and contactless are how most customers now expect to pay in person, and cards are a widely expected payment method online. The setup takes an afternoon; the lost sales from skipping it repeat every single day.
What "done" looks like
- You can take card and contactless payments wherever you sell, counter, curbside, or checkout page
- A real card transaction has succeeded and the money reached your business bank account
- Receipts go out automatically
- You know your effective fee rate (typically 1.5-3% per transaction)
How to do it
- Pick a processor that fits how you sell, Square or SumUp for counters and mobile setups, Stripe or your e-commerce platform's native payments for online, or one provider that covers both.
- Connect your business bank account for payouts before your first sale.
- Order the hardware if you sell in person, a basic reader runs $0-$60, a full terminal $100-$300.
- Run a live test, charge a real card, refund it, and confirm the receipt and the payout timeline (usually 1-2 business days).
- Advertise that you take cards, on the door, the menu, the website. It measurably changes buying behavior.
Common mistakes
- Signing a multi-year terminal lease from a legacy provider, modern processors have no lock-in
- Ignoring fees until they surprise you, 2.6% on everything is real money at volume, so price it in
- Online: forcing customers to create an account before they can pay
Real-world examples
- Square made in-person card acceptance trivial for tiny businesses. Its original mobile reader (launched around 2009 to 2010) simply swiped magnetic-stripe cards from a phone or tablet, with no long-term contract, complex approval, or upfront cost. Square didn't ship a chip-and-contactless reader until 2015. It has since become a cornerstone of US small-business payments.
- For online sales, the equivalent default is Stripe. Most bootstrapped founders wire up hosted checkout before building anything custom. The same reflex is covered in setting up Stripe billing and an online storefront.
- The general pattern for a new business is to reach for a hosted processor first (Square in person, Stripe online) and only consider bespoke payment integrations once volume clearly justifies the engineering.
From a founder's point of view
Being cash-only quietly turns away every customer who assumed they could tap a card, and most of them won't come back to ask. Modern readers make acceptance almost frictionless, so the real decision is just picking a processor and eating a small per-transaction fee as a cost of doing business. The fee stings less than the sales you never made because someone had no cash on them.
Rule of thumb
If a customer holding a card or a phone can pay you in under 30 seconds, you are done.
