Are you looking for a merchant account or card issuing platform? If you are looking for a card issuing service for visa and Mastercard then services like Lithic, Pismo, Unlimit, Hydrogen ETC. If you are looking for the full integration card issuing, deposit accounts, transfers, etc via a sponsor bank then a service like Solidfi (US) would be your best bet to be able to get up and running quickly. We used Lithic in the past and currently building on the Solidfi platform. Both services are very good but neither is plug and play.