HostedGatewayConfig
constructor(gatewayId: GatewayId, displayName: String, region: String, docsPath: String, blurb: String, capabilities: Set<Capability> = setOf(Capability.ONE_TIME_PAYMENT, Capability.CARDS), status: GatewayStatus = GatewayStatus.MOCK_MODE, buildCheckoutUrl: (Map<String, String>) -> String, matchReturn: (String) -> HostedReturnOutcome?)