Problem: need to add rpc endpoint personal_unpair

rpc/ethereum/namespaces/personal/api.go

@@ -222,3 +222,11 @@ func (api *PrivateAccountAPI) EcRecover(_ context.Context, data, sig hexutil.Byt
 
 	return crypto.PubkeyToAddress(*pubkey), nil
 }
+
+// Unpair deletes a pairing between wallet and ethermint.
+func (api *PrivateAccountAPI) Unpair(_ context.Context, url string, pin string) error {
+	api.logger.Debug("personal_unpair", "url", url, "pin", pin)
+	api.logger.Info("personal_unpair for smartcard wallet not supported")
+	// TODO: Smartcard wallet not supported yet, refer to: https://github.com/ethereum/go-ethereum/blob/master/accounts/scwallet/README.md
+	return fmt.Errorf("smartcard wallet not supported yet")
+}

tests/rpc/personal_test.go

@@ -2,6 +2,7 @@ package rpc
 
 import (
 	"encoding/json"
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -142,3 +143,13 @@ func TestPersonal_LockAccount(t *testing.T) {
 	_, err = CallWithError("personal_sign", []interface{}{hexutil.Bytes{0x88}, addr, ""})
 	require.Error(t, err)
 }
+
+func TestPersonal_Unpair(t *testing.T) {
+	t.Skip("skipping TestPersonal_Unpair")
+
+	rpcRes := Call(t, "personal_unpair", []interface{}{"", 0})
+
+	var res error
+	err := json.Unmarshal(rpcRes.Result, &res)
+	require.Equal(t, fmt.Errorf("smartcard wallet not supported yet"), err)
+}