UK's fraud reimbursement platform, run by Pay.UK for the Payment Systems Regulator, has seen slow adoption by financial institutions.Since its launch, the platform has onboarded 558 companies out of its goal of 1,500.Most claims are still being processed on an older system operated by UK Finance, as the mandatory adoption of the new platform was delayed.The reimbursement rules require UK banks and payment companies to reimburse victims of authorized push payment fraud up to £85,000 ($111,000).