> I'm not an expert dealing with PSP, but situations where a payment is validated through a "return to merchant URL" is risky and could lead to payment being ca

> I'm not an expert dealing with PSP, but situations where a payment is validated through a "return to merchant URL" is risky and could lead to payment being captured without the merchant being notified. There are ways to deal with that - a very simple one is a "mop up" process, as suggested by the GOV.UK Pay Service: https://docs.payments.service.gov.uk/integrate_with_govuk_pay/#make-sure-that-all-payments-are-processed https://docs.payments.service.gov.uk/integrate_with_govuk_pa...