London-based payments infrastructure provider Primer has raised $100m in a Series C funding round to make payments fully AI-enabled.The raise was led by Sofina, with participation from Peak XV Partners alongside existing investors Balderton, Accel, ICONIQ, Tencent and Speedinvest.Founded in 2020 by ex-Paypal employees, Primer’s platform lets large e-commerce merchants connect their entire payments stack and manage a variety of payment services providers at once.Payments heavyweights Checkout.com, Stripe, WorldPay, Klarna and GoCardless are all available through the platform.The startup launched an AI agent in November last year called Primer Companion that understands the context of a merchant’s payment ecosystem allowing users to receive recommendations, ask questions and have approved changes automatically implemented.With the new funding, Primer aims to double down on its AI investment by expanding the agent’s capabilities so it can operate completely on its own using parameters set by the merchants.“In the next few years, every payment decision in a large business will be initiated, optimised or audited by AI,” says Gabriel Le Roux, CEO and cofounder of Primer. The funding will also be used to drive the fintech’s US expansion as it plans to grow US revenue to more than a third of its business by 2028 and hire up to 50 roles in the country.