diff --git a/.env.example b/.env.example
index 5fba10d..d886542 100644
--- a/.env.example
+++ b/.env.example
@@ -1,16 +1,18 @@
-PACTUS_NODES=bootstrap1.pactus.org:50051,bootstrap2.pactus.org:50051,bootstrap3.pactus.org:50051,bootstrap4.pactus.org:50051,151.115.110.114:50051,188.121.116.247:50051",
-PACTUS_BRIDGE_ADDRESS=
+# Enviroment
+ENVIROMENT=(dev | prod)
 
-Fee=
-DB_PATH=
+# Pactus
 
-TELEGRAM_BOT_TOKEN=
-TELEGRAM_CHAT_ID=
+# Wrapto Lock Address
+PACTUS_WALLET_ADDRESS=
+PACTUS_WALLET_PASSWORD=
+PACTUS_WALLET_PATH=
+PACTUS_RPC=
 
+# Polygon
+POLYGON_PRIVATE_KEY=
 POLYGON_CONTRACT_ADDRESS=
 POLYGON_RPC=
-POLYGON_PRIVATE_KEY=
 
-WALLET_PATH=
-WALLET_ADDRESS=
-WALLET_PASSWORD=
\ No newline at end of file
+# Database
+DATABASE_PATH=
diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..eb52777
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,71 @@
+package config
+
+import (
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	Environment string
+	Pactus      PactusConfig
+	Polygon     PolygonConfig
+	Database    DatabaseConfig
+}
+
+type PactusConfig struct {
+	WalletPath string
+	WalletPass string
+	LockAddr   string
+	RPCNode    string
+}
+
+type PolygonConfig struct {
+	PrivateKey   string
+	ContractAddr string
+	RPCNode      string
+}
+
+type DatabaseConfig struct {
+	Path string
+}
+
+func LoadConfig() (*Config, error) {
+	if err := godotenv.Load(); err != nil {
+		return nil, err
+	}
+
+	cfg := &Config{
+		Environment: os.Getenv("NETWORK"),
+		Pactus: PactusConfig{
+			WalletPath: os.Getenv("PACTUS_WALLET_PATH"),
+			WalletPass: os.Getenv("PACTUS_WALLET_PASSWORD"),
+			LockAddr:   os.Getenv("PACTUS_WALLET_ADDRESS"),
+			RPCNode:    os.Getenv("PACTUS_RPC"),
+		},
+		Polygon: PolygonConfig{
+			PrivateKey:   os.Getenv("POLYGON_PRIVATE_KEY"),
+			ContractAddr: os.Getenv("POLYGON_CONTRACT_ADDRESS"),
+			RPCNode:      os.Getenv("POLYGON_RPC"),
+		},
+		Database: DatabaseConfig{
+			os.Getenv("DATABASE_PATH"),
+		},
+	}
+
+	if err := cfg.basicCheck(); err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}
+
+func (c *Config) basicCheck() error {
+	if !(c.Environment == "dev") || !(c.Environment == "prod") {
+		return InvalidEnvironmentError{
+			Environment: c.Environment,
+		}
+	}
+
+	return nil
+}
diff --git a/config/erros.go b/config/erros.go
new file mode 100644
index 0000000..e99f385
--- /dev/null
+++ b/config/erros.go
@@ -0,0 +1,11 @@
+package config
+
+import "fmt"
+
+type InvalidEnvironmentError struct {
+	Environment string
+}
+
+func (e InvalidEnvironmentError) Error() string {
+	return fmt.Sprintf("environment can be `dev` or `prod` not: %s", e.Environment)
+}
diff --git a/go.mod b/go.mod
index f98dcd7..e8c6636 100644
--- a/go.mod
+++ b/go.mod
@@ -45,6 +45,7 @@ require (
 	github.com/holiman/uint256 v1.2.4 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/joho/godotenv v1.5.1
 	github.com/kilic/bls12-381 v0.1.0 // indirect
 	github.com/matoous/go-nanoid v1.5.0
 	github.com/mattn/go-isatty v0.0.20 // indirect
diff --git a/go.sum b/go.sum
index 6848220..180bb85 100644
--- a/go.sum
+++ b/go.sum
@@ -170,6 +170,8 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/kilic/bls12-381 v0.1.0 h1:encrdjqKMEvabVQ7qYOKu1OvhqpK4s47wDYtNiPtlp4=
 github.com/kilic/bls12-381 v0.1.0/go.mod h1:vDTTHJONJ6G+P2R74EhnyotQDTliQDnFEwhdmfzw1ig=
 github.com/klauspost/compress v1.17.2 h1:RlWWUY/Dr4fL8qk9YG7DTZ7PDgME2V4csBXA8L/ixi4=
diff --git a/sides/manager/manager.go b/sides/manager/manager.go
index a6bb677..455b11d 100644
--- a/sides/manager/manager.go
+++ b/sides/manager/manager.go
@@ -8,28 +8,28 @@ import (
 )
 
 type Mgr struct {
-	Ctx      context.Context
-	Highway  chan message.Message
-	Bypasses map[bypass.Name]chan message.Message
+	ctx      context.Context
+	highway  chan message.Message
+	bypasses map[bypass.Name]chan message.Message
 }
 
 func NewManager(ctx context.Context) *Mgr {
 	return &Mgr{
-		Ctx:      ctx,
-		Highway:  make(chan message.Message, 10),                 // TODO: cap
-		Bypasses: make(map[bypass.Name]chan message.Message, 10), // TODO: cap
+		ctx:      ctx,
+		highway:  make(chan message.Message, 10),                 // TODO: what should we use as size?
+		bypasses: make(map[bypass.Name]chan message.Message, 10), // TODO: what should we use as size?
 	}
 }
 
 func (m *Mgr) Start() {
 	for {
 		select {
-		case msg := <-m.Highway:
+		case msg := <-m.highway:
 			err := m.routing(msg)
 			if err != nil {
 				continue
 			}
-		case <-m.Ctx.Done():
+		case <-m.ctx.Done():
 			return
 		}
 	}
@@ -38,7 +38,7 @@ func (m *Mgr) Start() {
 func (m *Mgr) RegisterBypass(name bypass.Name, b chan message.Message) error {
 	_, ok := m.isRegistered(name)
 	if !ok {
-		m.Bypasses[name] = b
+		m.bypasses[name] = b
 
 		return nil
 	}
@@ -57,7 +57,7 @@ func (m *Mgr) routing(msg message.Message) error {
 }
 
 func (m *Mgr) isRegistered(name bypass.Name) (chan message.Message, bool) {
-	v, ok := m.Bypasses[name]
+	v, ok := m.bypasses[name]
 
 	return v, ok
 }
diff --git a/sides/pactus/bridge.go b/sides/pactus/bridge.go
index 8317de1..2236990 100644
--- a/sides/pactus/bridge.go
+++ b/sides/pactus/bridge.go
@@ -14,7 +14,7 @@ type Bridge struct {
 	bypass     chan message.Message
 }
 
-func NewBridge(w *Wallet, b chan message.Message, bn bypass.Name) Bridge {
+func newBridge(w *Wallet, b chan message.Message, bn bypass.Name) Bridge {
 	return Bridge{
 		wallet:     w,
 		bypass:     b,
diff --git a/sides/pactus/client.go b/sides/pactus/client.go
index ea4276b..2069686 100644
--- a/sides/pactus/client.go
+++ b/sides/pactus/client.go
@@ -16,7 +16,7 @@ type Client struct {
 	ctx context.Context
 }
 
-func NewClient(c context.Context, endpoint string) (*Client, error) {
+func newClient(c context.Context, endpoint string) (*Client, error) {
 	conn, err := grpc.Dial(endpoint,
 		grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
diff --git a/sides/pactus/listener.go b/sides/pactus/listener.go
index edffd78..e485926 100644
--- a/sides/pactus/listener.go
+++ b/sides/pactus/listener.go
@@ -15,18 +15,21 @@ type Listener struct {
 	nextBlock uint32
 	bypass    bypass.Name
 	highway   chan message.Message
+	lockAddr  string
 
 	ctx context.Context
 }
 
-func NewListener(ctx context.Context,
-	client *Client, bp bypass.Name, highway chan message.Message, startBlock uint32,
+func newListener(ctx context.Context,
+	client *Client, bp bypass.Name, highway chan message.Message,
+	startBlock uint32, lockAddr string,
 ) *Listener {
 	return &Listener{
 		client:    client,
 		bypass:    bp,
 		highway:   highway,
 		nextBlock: startBlock,
+		lockAddr:  lockAddr,
 
 		ctx: ctx,
 	}
@@ -63,7 +66,7 @@ func (l *Listener) ProcessBlocks() error {
 		return err // TODO: handle errors from client
 	}
 
-	validTxs := filterValidTxs(blk.Txs)
+	validTxs := l.filterValidTxs(blk.Txs)
 
 	for _, tx := range validTxs {
 		dest, err := parseMemo(tx.Memo)
@@ -101,13 +104,12 @@ func (l *Listener) isEligibleBlock(h uint32) (bool, error) {
 	return h < lst, nil
 }
 
-func filterValidTxs(txs []*pactus.TransactionInfo) []*pactus.TransactionInfo {
+func (l *Listener) filterValidTxs(txs []*pactus.TransactionInfo) []*pactus.TransactionInfo {
 	validTxs := make([]*pactus.TransactionInfo, 0)
 
 	for _, tx := range txs {
-		// TODO:read LOCKED ADDRESS from config
 		if tx.PayloadType != pactus.PayloadType_TRANSFER_PAYLOAD &&
-			tx.GetTransfer().Receiver != "LOCKED_ADDRESS" {
+			tx.GetTransfer().Receiver != l.lockAddr {
 			continue
 		}
 
diff --git a/sides/pactus/pactus.go b/sides/pactus/pactus.go
index 2ed2db4..5b837c2 100644
--- a/sides/pactus/pactus.go
+++ b/sides/pactus/pactus.go
@@ -3,8 +3,10 @@ package pactus
 import (
 	"context"
 
+	"github.com/PACZone/wrapto/config"
 	"github.com/PACZone/wrapto/types/bypass"
 	"github.com/PACZone/wrapto/types/message"
+	"github.com/pactus-project/pactus/crypto"
 )
 
 type Side struct {
@@ -17,16 +19,25 @@ type Side struct {
 }
 
 func NewSide(ctx context.Context,
-	highway chan message.Message, startBlock uint32, w *Wallet, b chan message.Message,
+	highway chan message.Message, startBlock uint32,
+	b chan message.Message, env string, cfg config.PactusConfig,
 ) (*Side, error) {
-	client, err := NewClient(ctx, "") // TODO:read rpc url from config
+	if env == "dev" {
+		crypto.AddressHRP = "tpc"
+	}
+
+	client, err := newClient(ctx, cfg.RPCNode)
 	if err != nil {
 		return nil, err
 	}
 
-	listener := NewListener(ctx, client, bypass.PACTUS, highway, startBlock)
+	wallet, err := openWallet(cfg.WalletPath, cfg.LockAddr, cfg.RPCNode, cfg.WalletPass)
+	if err != nil {
+		return nil, err
+	}
 
-	bridge := NewBridge(w, b, bypass.PACTUS)
+	listener := newListener(ctx, client, bypass.PACTUS, highway, startBlock, cfg.LockAddr)
+	bridge := newBridge(wallet, b, bypass.PACTUS)
 
 	return &Side{
 		client:   client,
diff --git a/sides/pactus/wallet.go b/sides/pactus/wallet.go
index e26deda..d36f4ab 100644
--- a/sides/pactus/wallet.go
+++ b/sides/pactus/wallet.go
@@ -14,7 +14,7 @@ type Wallet struct {
 	wallet   pWallet.Wallet
 }
 
-func Open(path, addr, rpcURL, pass string) (*Wallet, error) {
+func openWallet(path, addr, rpcURL, pass string) (*Wallet, error) {
 	if !doesWalletExist(path) {
 		return nil, WalletNotExistError{
 			path: path,
diff --git a/sides/polygon/bridge.go b/sides/polygon/bridge.go
index 50588eb..cf0dc9a 100644
--- a/sides/polygon/bridge.go
+++ b/sides/polygon/bridge.go
@@ -14,9 +14,9 @@ type Bridge struct {
 	bypass     chan message.Message
 }
 
-func NewBridge(b chan message.Message, bn bypass.Name, c *Client) Bridge {
+func newBridge(bp chan message.Message, bn bypass.Name, c *Client) Bridge {
 	return Bridge{
-		bypass:     b,
+		bypass:     bp,
 		bypassName: bn,
 		client:     c,
 	}
diff --git a/sides/polygon/client.go b/sides/polygon/client.go
index 5d504d3..29ad676 100644
--- a/sides/polygon/client.go
+++ b/sides/polygon/client.go
@@ -25,7 +25,7 @@ type BridgeOrder struct {
 	Fee                *big.Int
 }
 
-func NewClient(rpcURL, pk, cAddr string, chainID int64) (*Client, error) {
+func newClient(rpcURL, pk, cAddr string, chainID int64) (*Client, error) {
 	client, err := ethclient.Dial(rpcURL)
 	if err != nil {
 		return nil, err
diff --git a/sides/polygon/listener.go b/sides/polygon/listener.go
index ce0d68c..df6df69 100644
--- a/sides/polygon/listener.go
+++ b/sides/polygon/listener.go
@@ -22,7 +22,7 @@ type Listener struct {
 	ctx context.Context
 }
 
-func NewListener(ctx context.Context,
+func newListener(ctx context.Context,
 	client *Client, bp bypass.Name, highway chan message.Message, startOrder uint32,
 ) *Listener {
 	return &Listener{
@@ -51,11 +51,12 @@ func (l *Listener) Start() {
 func (l *Listener) ProcessOrder() error {
 	o, err := l.client.Get(*big.NewInt(int64(l.nextOrder)))
 	if err != nil {
-		return nil
+		return err
 	}
 
 	if o.Sender == common.HexToAddress("0x0000000000000000000000000000000000000000") {
 		<-time.After(20 * time.Second)
+
 		return nil
 	}
 
diff --git a/sides/polygon/polygon.go b/sides/polygon/polygon.go
index 5a19856..0faff31 100644
--- a/sides/polygon/polygon.go
+++ b/sides/polygon/polygon.go
@@ -3,30 +3,48 @@ package polygon
 import (
 	"context"
 
+	"github.com/PACZone/wrapto/config"
 	"github.com/PACZone/wrapto/types/bypass"
 	"github.com/PACZone/wrapto/types/message"
 )
 
+const (
+	mainChainID   int64 = 137
+	mumbaiChainID int64 = 80001
+)
+
 type Side struct {
 	client   *Client
 	listener *Listener
+	bridge   Bridge
 	highway  chan message.Message
+	bypass   chan message.Message
 
 	ctx context.Context
 }
 
-func NewSide(ctx context.Context, highway chan message.Message, startOrder uint32, b chan message.Message, rpcURL, pk, cAddr string, chainID int64) (*Side, error) {
-	client, err := NewClient(rpcURL, pk, cAddr, chainID)
+func NewSide(ctx context.Context, highway chan message.Message, startOrder uint32,
+	bp chan message.Message, env string, cfg config.PolygonConfig,
+) (*Side, error) {
+	chainID := mainChainID
+	if env == "dev" {
+		chainID = mumbaiChainID
+	}
+
+	client, err := newClient(cfg.RPCNode, cfg.PrivateKey, cfg.ContractAddr, chainID)
 	if err != nil {
 		return nil, err
 	}
 
-	listener := NewListener(ctx, client, bypass.POLYGON, highway, startOrder)
+	listener := newListener(ctx, client, bypass.POLYGON, highway, startOrder)
+	bridge := newBridge(bp, bypass.POLYGON, client)
 
 	return &Side{
 		client:   client,
 		listener: listener,
+		bridge:   bridge,
 		highway:  highway,
+		bypass:   bp,
 
 		ctx: ctx,
 	}, nil