How to choose a payment gateway for an Australian ecommerce store

Payment gateway choice tends to get treated as a five-minute setup decision, ticked off during the store build and rarely revisited. That is a mistake. The gateway you choose sits at the exact moment a visitor decides whether to trust you with their card details, and it quietly sets your transaction costs for every sale you will ever process. A half-percent difference in fees, or a missing payment method your customers expect, shows up nowhere in your analytics dashboard directly — it just shows up as a slightly lower conversion rate and a slightly thinner margin, month after month.

The good news is that the decision is more structured than it looks. It comes down to four questions: which payment methods your customers actually expect, what each option really costs once you account for settlement terms, whether buy-now-pay-later is worth the commission for your product, and how much technical flexibility you need. Work through those in order and the right combination becomes obvious.

What payment methods do Australian shoppers actually expect?

Australian ecommerce buyers arrive with a fairly fixed mental checklist: Visa and Mastercard at minimum, PayPal as a trusted fallback, and — depending on your category — a buy-now-pay-later option such as Afterpay or Zip. Apple Pay and Google Pay have also become close to table stakes on mobile, since they remove the need to type a card number at all. Missing any of these does not necessarily stop a determined buyer, but it adds friction at exactly the point where friction is most expensive, which is the moment before checkout completion.

The instinct is to offer everything, but every additional payment method also adds a monthly fee, a reconciliation line in your accounts, and one more integration that can break during a platform update. The practical approach is to start with cards plus one digital wallet and one BNPL provider, then add more only when you have evidence — abandoned-cart data, direct customer requests, or a competitor comparison — that a specific method is actually costing you sales.

Stripe vs PayPal vs Afterpay vs Zip vs Square: which should you choose?

Each provider optimises for a different job. Stripe and Square are primarily card processors with strong developer tooling; PayPal is a trust brand with its own wallet; Afterpay and Zip are credit providers that take on repayment risk in exchange for a much higher commission. None of them is objectively "the best" — the right answer depends on your average order value, your platform, and how much of the buyer relationship you want to own directly.

Provider	Typical merchant cost*	Settlement speed	Best suited to
Stripe	Roughly 1.7%–1.9% + a small fixed fee on domestic Australian cards; higher for international cards	Around 2 business days	Custom checkouts, subscriptions, stores that want developer flexibility
Square	Similar range to Stripe on card-not-present transactions	1–2 business days	Stores that also sell in person and want one system for both
PayPal	Generally a little higher than Stripe/Square, reducing with monthly volume	Near-instant to PayPal balance; 1–3 days to bank	Buyer trust, first-time customers, cross-border sales
Afterpay	A merchant commission in the mid-single digits, no fee to the shopper	Paid to merchant upfront, shopper repays in instalments	Fashion, homewares, higher AOV items, younger buyers
Zip	Broadly comparable commission structure to Afterpay	Paid to merchant upfront	Similar categories to Afterpay, slightly broader age range

*Illustrative ranges only — providers set pricing by merchant category, volume and negotiated tier, so confirm current rates directly with each provider before deciding.

For most Australian stores under roughly $2 million in annual revenue, the practical starting stack is a card processor (Stripe or Square) plus PayPal, added at launch, with a BNPL provider layered in once you have enough order volume to judge whether it moves your conversion rate. Stores on Shopify get Shopify Payments (built on Stripe's infrastructure) as a default, which is usually the simplest starting point precisely because it removes one integration decision entirely — a factor worth weighing alongside the platform trade-offs covered in Shopify vs WooCommerce.

The headline percentage is rarely the whole cost, either. Chargebacks typically carry their own fee on top of the reversed transaction, currency conversion on international cards adds a margin most providers don't advertise clearly, and some gateways charge a separate fee for early or manual payouts. None of these are large individually, but a store with a high return rate or a meaningful share of international customers should ask each provider directly about chargeback fees and FX margin before committing, rather than comparing headline processing rates alone.

Should you offer buy now, pay later?

BNPL is the highest-leverage and highest-cost decision in this stack, so it deserves its own test rather than a default yes. The commission a provider like Afterpay or Zip charges is typically several times higher than a standard card processing fee, because the provider is effectively extending short-term credit and absorbing the default risk on your behalf. That cost only makes sense if BNPL genuinely increases how many people buy, or how much they spend per order, by more than the extra commission costs you.

It tends to earn its cost for higher-priced, discretionary, aspirational purchases — furniture, fashion, beauty, homewares — sold to a younger customer base who use instalments as a budgeting tool rather than a last resort. It tends to underperform for low-priced, high-frequency, or business-to-business purchases, where the commission simply erodes margin without changing buyer behaviour. If you are unsure, the honest test is a controlled trial: enable it for a defined period, and compare average order value and conversion rate against a comparable prior period rather than assuming the uplift.

What does payment security actually require?

Every reputable gateway (Stripe, Square, PayPal, Afterpay, Zip) handles PCI DSS compliance for the card data itself, provided you use their hosted checkout or official plugin rather than building your own card form. That single choice — using the provider's hosted fields instead of custom-building a payment form — removes the vast majority of your compliance burden, because card numbers never touch your own servers. Where store owners run into trouble is usually not the gateway itself but customisations: a developer-built checkout that captures card details directly, or a plugin that stores payment tokens insecurely. If in doubt, the safest default is the gateway's own hosted checkout, not a custom-built alternative.

How do you switch gateways without disrupting sales?

Switching is more common than most owners expect — margins tighten, a platform migration forces the issue, or a provider changes its terms. Run both gateways in parallel for a short transition window rather than cutting over on a single day, so that subscription billing, saved cards and any in-flight BNPL repayments keep working. Reconcile a full sales cycle against your accounting software before fully retiring the old gateway, and confirm any recurring billing (memberships, subscriptions) has genuinely migrated rather than silently failing on the next renewal date. The stores that get burned by a switch are almost always the ones that flipped a single toggle without a transition period.

Which payment gateway is right for your store?

Work through it in this order: confirm your platform's default option first (Shopify Payments, WooCommerce's built-in Stripe integration, or equivalent), add PayPal if you sell to first-time or cross-border customers who value a familiar brand, and only add BNPL once your average order value and product category make the commission worth paying. Revisit the decision roughly once a year, or whenever a provider changes its pricing tier — the gateway that was right at launch is not necessarily the one that is still cheapest once you have real volume behind you. Getting this stack right is one of the quieter levers behind the broader growth picture in the five levers that separate growing stores from stagnating ones. If you want a second opinion on your current payment setup and what it is actually costing you, book a consultation and we will work through the numbers together.