refactored initialization

api/gateway/chain/internal/service/gateway/options.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/tech/sendico/gateway/chain/internal/keymanager"
+	"github.com/tech/sendico/gateway/chain/internal/service/gateway/rpcclient"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/shared"
 	clockpkg "github.com/tech/sendico/pkg/clock"
 )
@@ -25,6 +26,13 @@ func WithTransferExecutor(executor TransferExecutor) Option {
 	}
 }
 
+// WithRPCClients configures pre-initialised RPC clients.
+func WithRPCClients(clients *rpcclient.Clients) Option {
+	return func(s *Service) {
+		s.rpcClients = clients
+	}
+}
+
 // WithNetworks configures supported blockchain networks.
 func WithNetworks(networks []shared.Network) Option {
 	return func(s *Service) {