FCA registration is required only if you issue non-bank cards. Since you're working with an issuing bank, you'd be nothing more than an authorized affiliate for them, so FCA registration is not required.
Do I need FCA registration to issue or distribute prepaid cards?
What registrations and licenses are required to run an electronic money business?1 ansHow does Payoneer legally provide bank accounts to non-UK residents?1 ansIf an app only connects people to hawaladars but never touches funds, does it need FCA or HMRC registration in the UK?1 ansHow do electronic payments companies operate?1 ans