Open Banking and A2A Payments in 2026: Real-Time Settlement, PSD3 Updates, and Merchant Benefits

What if customers could pay you directly from their bank account — in seconds, with no card network in the middle?

That is account-to-account (A2A) payments, powered by open banking APIs and real-time settlement. A2A is no longer theoretical. It is processing hundreds of billions of dollars annually across Europe, the UK, Brazil, India, Australia, and increasingly North America.

The principle is elegantly simple: rather than routing a payment through a card network that adds cost and latency, A2A payments transfer funds directly from the customer's bank account to the merchant's bank account using secure API connections authenticated through the customer's banking application. The result is a payment that settles in real time, costs pennies rather than percentage points, and carries no chargeback risk for the merchant. For high-risk merchants who face elevated processing fees and chargeback ratios under card network rules, A2A payments offer a genuinely superior alternative.

This article explores the current state of open banking and A2A payments in 2026, the regulatory developments including PSD3 that are shaping the ecosystem, and the practical benefits for merchants considering A2A payment acceptance.

PSD3: The Next Generation of European Payment Regulation

The most consequential regulatory development for open banking payments in 2026 is the implementation of the EU's Third Payment Services Directive (PSD3), which took effect in phases beginning in late 2025. PSD3 builds on the foundation established by PSD2 but addresses several critical limitations that had constrained the growth of open banking payments.

Mandated API performance standards. Under PSD2, banks were required to provide API access to third-party providers (TPPs), but the directive did not specify performance standards for those APIs. In practice, many banks provided APIs that were slow, unreliable, or lacked the functionality needed for payment initiation. PSD3 addresses this by mandating specific API performance requirements, including maximum response times, uptime guarantees, and feature parity with the bank's own customer-facing interfaces. Banks that fail to meet these standards face regulatory penalties, and several have already been sanctioned for non-compliance in early 2026.

Expanded scope for payment initiation. PSD3 expands the scope of services that A2A payment providers can offer. Under PSD2, payment initiation service providers (PISPs) were limited to initiating individual payments at the request of the consumer. PSD3 authorizes PISPs to initiate recurring payments, manage standing orders, and facilitate variable recurring payments (VRPs) a feature that has been particularly transformative for subscription-based merchants. VRPs allow customers to authorize recurring payments up to a predefined cap without needing to re-authenticate for each transaction, creating a user experience comparable to card-on-file recurring billing but with the cost and settlement advantages of A2A payments.

Strong customer authentication (SCA) modernization. PSD3 introduces more flexible SCA requirements that recognize the evolution of authentication technology. Biometric authentication is explicitly recognized as meeting SCA requirements, and the directive provides for a risk-based approach that allows simplified authentication for low-risk, low-value transactions. This has significantly reduced the friction associated with A2A payment initiation, improving conversion rates for merchants who had experienced checkout abandonment under PSD2's more rigid SCA requirements.

Third-party provider liability protection. Perhaps most importantly for the development of the A2A ecosystem, PSD3 provides clear liability protections for TPPs. Under PSD2, the allocation of liability between banks and TPPs in cases of unauthorized transactions or technical failures was ambiguous, creating legal risk that deterred investment in open banking infrastructure. PSD3 establishes clear liability rules: banks are liable for failures in their API infrastructure, TPPs are liable for failures in their own systems, and the consumer is protected from loss in all cases except gross negligence. This clarity has open uped significant investment in open banking payment infrastructure, with venture capital investment in European open banking startups reaching record levels in the first half of 2026.

The impact of PSD3 is already visible in the payments data. A2A payment volumes in the EU have grown by over 150 percent since the implementation of the directive's core provisions, with particularly strong growth in e-commerce checkout, subscription billing, and high-value B2B payments.

Real-Time Settlement: The Killer Feature of A2A Payments

The defining advantage of A2A payments over card-based processing is real-time settlement. When a customer initiates an A2A payment through their banking app, the funds are debited from their account and credited to the merchant's account in seconds, regardless of the time of day, day of the week, or holiday schedule. This is fundamentally different from card payments, which settle through the card network's batch process on a one- to three-day cycle, and even from "fast" card settlement programs that still operate on next-day schedules.

Cash flow transformation. For merchants, the shift from delayed to instant settlement transforms cash flow management. A merchant processing $500,000 per month in A2A payments has access to those funds immediately rather than waiting days for settlement batches to clear. For high-risk merchants who often face extended settlement holds of 7 to 14 days under card processing agreements, the improvement is even more dramatic. The acceleration of settlement cycles reduces or eliminates the need for working capital advances, invoice factoring, or merchant cash advances, saving merchants thousands of dollars per year in financing costs.

Settlement finality. Unlike card payments, which remain subject to chargebacks for 90 to 120 days after the transaction, A2A payments settle with finality. Once the funds reach the merchant's account, the transaction is effectively irreversible. While some dispute resolution mechanisms exist for cases of fraud or error, the merchant's exposure to chargeback losses is eliminated for A2A transactions. For merchants in high-risk categories where chargeback ratios can exceed 2 percent of transaction volume, the savings from reduced chargeback losses alone can offset the cost of integrating A2A payment acceptance.

Integration with real-time payment rails. A2A payments in most markets settle through domestic real-time payment systems: the UK's Faster Payments Service, Europe's SEPA Instant, India's UPI, Brazil's PIX, and Australia's New Payments Platform. These systems provide the underlying settlement infrastructure that makes instant A2A payments possible. The combination of open banking APIs for payment initiation and real-time payment rails for settlement creates an end-to-end payment experience that matches the speed of card payments while offering dramatically better economics.

Merchant Benefits Beyond Cost Savings

While the cost advantages of A2A payments over card processing are well documented, several additional benefits are driving merchant adoption in 2026.

Higher authorization rates. Card payments are subject to a complex approval process involving issuer authorization decisions, network rules, and fraud screening that can result in false declines. A2A payments, by contrast, are authorized directly by the customer through their banking app. As long as the customer has sufficient funds and successfully authenticates, the payment is approved. Authorization rates for A2A payments consistently exceed 95 percent, compared to 70 to 85 percent for card payments in many high-risk categories. For merchants who lose significant revenue to false declines, the improvement in authorization rates can have a meaningful impact on top-line revenue.

Reduced fraud exposure. A2A payments are authenticated through the customer's banking application using the same multi-factor authentication that the bank applies to its own digital banking services. This is a significantly more reliable authentication framework than the card-not-present environment, where a fraudster needs only the card number, expiration date, and CVV to initiate a transaction. The result is dramatically lower fraud rates for A2A payments compared to card transactions.

No interchange fees. A2A payments bypass the card network interchange system entirely. Instead of paying interchange fees that range from 1.5 to 3.5 percent for card transactions, merchants pay a fixed fee per transaction typically 10 to 50 cents for A2A payments through an open banking provider. For merchants with high average transaction values, the savings are particularly dramatic: a $5,000 transaction that would incur $150 in card processing fees costs under $1 as an A2A payment.

Simplified reconciliation. A2A payments arrive in the merchant's account with rich remittance data, including the customer's reference, invoice number, and transaction ID. This data is transmitted as part of the ISO 20022 payment message that accompanies real-time payment settlements, enabling automated reconciliation without the manual effort required to match card settlement reports to individual transactions.

The Global Landscape: Beyond Europe

While Europe has led the development of open banking regulation, A2A payments are gaining traction globally through different regulatory and market-driven approaches.

United Kingdom. The UK's open banking ecosystem, which predates and has influenced PSD3, continues to lead in terms of market maturity. Over 6 million UK consumers actively use open banking-enabled payment services, and A2A payments account for approximately 8 percent of UK e-commerce transaction volume. The Competition and Markets Authority's mandated implementation of variable recurring payments has been particularly successful, with VRPs now authorized for use across a wide range of merchant categories including utilities, insurance, subscriptions, and financial services.

Brazil. Brazil's open banking initiative, launched by the Central Bank of Brazil alongside the PIX real-time payment system, has achieved remarkable adoption. Brazilian consumers can initiate A2A payments through their banking apps using PIX as the underlying settlement rail, creating a smooth payment experience that has captured over 30 percent of Brazilian e-commerce volume. The combination of instant settlement, zero merchant fees (in most implementations), and ubiquitous consumer adoption has made PIX-enabled A2A payments the dominant digital payment method in Brazil.

India. India's UPI ecosystem, while not strictly an open banking framework in the European sense, achieves the same functional outcome: consumers can initiate A2A payments from their bank accounts through interoperable apps, with settlement occurring in real time through the UPI infrastructure. Over 350 million active UPI users generate more than 13 billion transactions per month, making India the world's largest A2A payment market by volume. For merchants serving Indian consumers, UPI integration is essential.

Australia and North America. Australia's Consumer Data Right framework has enabled open banking payments through the New Payments Platform, with growing merchant adoption in 2026. In the United States and Canada, open banking A2A payments are developing through market-driven initiatives rather than regulatory mandate, with the Financial Data Exchange (FDX) standard providing a common technical framework for API-based payment initiation. While adoption in North America lags behind Europe and Asia, several major US-based fintech companies have launched A2A payment products in 2026, and the Consumer Financial Protection Bureau's Section 1033 rulemaking on open banking is expected to accelerate adoption.

For merchants considering A2A payment integration, the path forward is clear. The combination of open banking payment initiation, real-time settlement rails, and supportive regulation has created a payment method that offers significant advantages over card processing for both merchants and consumers. As the managing director of a major European acquiring bank recently told us, "A2A payments are not a niche alternative they are the future of e-commerce payments."

Merchants who integrate A2A payments through platforms like alternative payment method aggregators and SEPA payment providers are finding that the benefits extend beyond cost savings to include higher authorization rates, reduced fraud, and simplified operations. For high-risk merchants in particular, the combination of instant settlement, chargeback elimination, and lower fees makes A2A payments a compelling addition to their payment mix.