restucturization of recipients payment methods

api/gateway/chain/internal/keymanager/keymanager.go

@@ -0,0 +1,23 @@
+package keymanager
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// ManagedWalletKey captures information returned after provisioning a managed wallet key.
+type ManagedWalletKey struct {
+	KeyID     string
+	Address   string
+	PublicKey string
+}
+
+// Manager defines the contract for managing managed wallet keys.
+type Manager interface {
+	// CreateManagedWalletKey provisions a new managed wallet key for the provided wallet reference and network.
+	CreateManagedWalletKey(ctx context.Context, walletRef string, network string) (*ManagedWalletKey, error)
+	// SignTransaction signs the provided transaction using the identified key material.
+	SignTransaction(ctx context.Context, keyID string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error)
+}