As A2A payments expand in UK commerce, clear “certainty of fate” confirmation is vital to ensure trust, avoid duplicate payments, and support reliable merchant fulfilment.
As account-to-account payments move into everyday retail and digital commerce, a deceptively simple question — did this payment work? — is proving surprisingly hard to answer.
Why Certainty of Fate matters to A2A payments in the UK
With growing ambitions for Open Banking payments in line with the National Payments Vision, Certainty of Fate has become a foundation for delivering trusted, real-time payment experiences. As A2A payments become more commonly available across retail, ecommerce and subscription journeys, both payers and payees need clear, timely and unambiguous confirmation of whether a payment has succeeded or failed, even if it may take a little longer for funds to arrive in the destination account.
Reliable Certainty of Fate underpins customer confidence. Without it, merchants may delay fulfilment, customers may retry payments unnecessarily, and payment service providers face operational burdens managing exceptions. As Mark explained, timely confirmation is particularly important at checkout, in physical stores or in digital services such as food delivery or media streaming. Even rare pockets of uncertainty, so-called “edge cases”, can undermine trust and hinder the adoption of A2A payments.
Key challenges identified
In a series of industry workshops that Pay.UK conducted in 2025 with Open Banking Limited, account providers, Payment Initiation Service Providers (PISPs), and trade associations identified four main barriers:
- Legacy Faster Payment System design
- Confusion around “qualified acceptances”
- Interaction between Faster Payment System rules and the regulation applying to Open Banking information flows
The path to improvement
Despite these challenges, the direction of travel is clear, and momentum is strong:
- Clarifying Faster Payment System rules
- Strengthening information flows to PISPs through clear mandates
- Ensuring merchants use suitable accounts
Joint industry engagement
We continue to collaborate with Open Banking Limited to ensure our two domains deliver a seamless A2A payments ecosystem. Alongside working closely with account providers, PISPs and financial trade associations to shape this work, we are also engaging with sponsor banks to ensure indirect participants can fully support Certainty of Fate where appropriate.
