diff --git a/common/db.go b/common/db.go
index e90fd47..5532dc9 100644
--- a/common/db.go
+++ b/common/db.go
@@ -32,7 +32,19 @@ const (
 	DATA_PUBLIC_KEY_REVERSE
 	DATA_ACTIVE_DECIMAL
 	DATA_ACTIVE_ADDRESS
-	DATA_TRANSACTIONS
+	// Start the sub prefix data at 256 (0x0100)
+	DATA_VOUCHER_SYMBOLS DataTyp = 256 + iota
+	DATA_VOUCHER_BALANCES
+	DATA_VOUCHER_DECIMALS
+	DATA_VOUCHER_ADDRESSES
+	DATA_TX_SENDERS
+	DATA_TX_RECIPIENTS
+	DATA_TX_VALUES
+	DATA_TX_ADDRESSES
+	DATA_TX_HASHES
+	DATA_TX_DATES
+	DATA_TX_SYMBOLS
+	DATA_TX_DECIMALS
 )
 
 var (
@@ -69,3 +81,10 @@ func StringToDataTyp(str string) (DataTyp, error) {
 		return 0, errors.New("invalid DataTyp string")
 	}
 }
+
+// ToBytes converts DataTyp or int to a byte slice
+func ToBytes[T ~uint16 | int](value T) []byte {
+	bytes := make([]byte, 2)
+	binary.BigEndian.PutUint16(bytes, uint16(value))
+	return bytes
+}
diff --git a/common/transfer_statements.go b/common/transfer_statements.go
index 4dd409c..4e6f66b 100644
--- a/common/transfer_statements.go
+++ b/common/transfer_statements.go
@@ -57,25 +57,25 @@ func ProcessTransfers(transfers []dataserviceapi.Last10TxResponse) TransferMetad
 // GetTransferData retrieves and matches transfer data
 // returns a formatted string of the full transaction/statement
 func GetTransferData(ctx context.Context, db storage.PrefixDb, publicKey string, index int) (string, error) {
-	keys := []string{"txfrom", "txto", "txval", "txaddr", "txhash", "txdate", "txsym"}
-	data := make(map[string]string)
+	keys := []DataTyp{DATA_TX_SENDERS, DATA_TX_RECIPIENTS, DATA_TX_VALUES, DATA_TX_ADDRESSES, DATA_TX_HASHES, DATA_TX_DATES, DATA_TX_SYMBOLS}
+	data := make(map[DataTyp]string)
 
 	for _, key := range keys {
-		value, err := db.Get(ctx, []byte(key))
+		value, err := db.Get(ctx, ToBytes(key))
 		if err != nil {
-			return "", fmt.Errorf("failed to get %s: %v", key, err)
+			return "", fmt.Errorf("failed to get %s: %v", ToBytes(key), err)
 		}
 		data[key] = string(value)
 	}
 
 	// Split the data
-	senders := strings.Split(string(data["txfrom"]), "\n")
-	recipients := strings.Split(string(data["txto"]), "\n")
-	values := strings.Split(string(data["txval"]), "\n")
-	addresses := strings.Split(string(data["txaddr"]), "\n")
-	hashes := strings.Split(string(data["txhash"]), "\n")
-	dates := strings.Split(string(data["txdate"]), "\n")
-	syms := strings.Split(string(data["txsym"]), "\n")
+	senders := strings.Split(string(data[DATA_TX_SENDERS]), "\n")
+	recipients := strings.Split(string(data[DATA_TX_RECIPIENTS]), "\n")
+	values := strings.Split(string(data[DATA_TX_VALUES]), "\n")
+	addresses := strings.Split(string(data[DATA_TX_ADDRESSES]), "\n")
+	hashes := strings.Split(string(data[DATA_TX_HASHES]), "\n")
+	dates := strings.Split(string(data[DATA_TX_DATES]), "\n")
+	syms := strings.Split(string(data[DATA_TX_SYMBOLS]), "\n")
 
 	// Check if index is within range
 	if index < 1 || index > len(senders) {
diff --git a/common/vouchers.go b/common/vouchers.go
index c542084..6cff91d 100644
--- a/common/vouchers.go
+++ b/common/vouchers.go
@@ -64,22 +64,23 @@ func ScaleDownBalance(balance, decimals string) string {
 
 // GetVoucherData retrieves and matches voucher data
 func GetVoucherData(ctx context.Context, db storage.PrefixDb, input string) (*dataserviceapi.TokenHoldings, error) {
-	keys := []string{"sym", "bal", "deci", "addr"}
-	data := make(map[string]string)
+	keys := []DataTyp{DATA_VOUCHER_SYMBOLS, DATA_VOUCHER_BALANCES, DATA_VOUCHER_DECIMALS, DATA_VOUCHER_ADDRESSES}
+	data := make(map[DataTyp]string)
 
 	for _, key := range keys {
-		value, err := db.Get(ctx, []byte(key))
+		value, err := db.Get(ctx, ToBytes(key))
 		if err != nil {
-			return nil, fmt.Errorf("failed to get %s: %v", key, err)
+			return nil, fmt.Errorf("failed to get %s: %v", ToBytes(key), err)
 		}
 		data[key] = string(value)
 	}
 
 	symbol, balance, decimal, address := MatchVoucher(input,
-		data["sym"],
-		data["bal"],
-		data["deci"],
-		data["addr"])
+		data[DATA_VOUCHER_SYMBOLS],
+		data[DATA_VOUCHER_BALANCES],
+		data[DATA_VOUCHER_DECIMALS],
+		data[DATA_VOUCHER_ADDRESSES],
+	)
 
 	if symbol == "" {
 		return nil, nil
diff --git a/common/vouchers_test.go b/common/vouchers_test.go
index 9f5bf85..ba6cd60 100644
--- a/common/vouchers_test.go
+++ b/common/vouchers_test.go
@@ -8,8 +8,9 @@ import (
 	"github.com/alecthomas/assert/v2"
 	"github.com/stretchr/testify/require"
 
-	"git.grassecon.net/urdt/ussd/internal/storage"
+	visedb "git.defalsify.org/vise.git/db"
 	memdb "git.defalsify.org/vise.git/db/mem"
+	"git.grassecon.net/urdt/ussd/internal/storage"
 	dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
 )
 
@@ -83,19 +84,21 @@ func TestGetVoucherData(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	spdb := storage.NewSubPrefixDb(db, []byte("vouchers"))
+
+	prefix := ToBytes(visedb.DATATYPE_USERDATA)
+	spdb := storage.NewSubPrefixDb(db, prefix)
 
 	// Test voucher data
-	mockData := map[string][]byte{
-		"sym":  []byte("1:SRF\n2:MILO"),
-		"bal":  []byte("1:100\n2:200"),
-		"deci": []byte("1:6\n2:4"),
-		"addr": []byte("1:0xd4c288865Ce\n2:0x41c188d63Qa"),
+	mockData := map[DataTyp][]byte{
+		DATA_VOUCHER_SYMBOLS:   []byte("1:SRF\n2:MILO"),
+		DATA_VOUCHER_BALANCES:  []byte("1:100\n2:200"),
+		DATA_VOUCHER_DECIMALS:  []byte("1:6\n2:4"),
+		DATA_VOUCHER_ADDRESSES: []byte("1:0xd4c288865Ce\n2:0x41c188d63Qa"),
 	}
 
 	// Put the data
 	for key, value := range mockData {
-		err = spdb.Put(ctx, []byte(key), []byte(value))
+		err = spdb.Put(ctx, []byte(ToBytes(key)), []byte(value))
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/internal/handlers/ussd/menuhandler.go b/internal/handlers/ussd/menuhandler.go
index ba82b47..b47e31f 100644
--- a/internal/handlers/ussd/menuhandler.go
+++ b/internal/handlers/ussd/menuhandler.go
@@ -85,8 +85,10 @@ func NewHandlers(appFlags *asm.FlagParser, userdataStore db.Db, adminstore *util
 	userDb := &common.UserDataStore{
 		Db: userdataStore,
 	}
-	// Instantiate the SubPrefixDb with "vouchers" prefix
-	prefixDb := storage.NewSubPrefixDb(userdataStore, []byte("vouchers"))
+
+	// Instantiate the SubPrefixDb with "DATATYPE_USERDATA" prefix
+	prefix := common.ToBytes(db.DATATYPE_USERDATA)
+	prefixDb := storage.NewSubPrefixDb(userdataStore, prefix)
 
 	h := &Handlers{
 		userdataStore:  userDb,
@@ -1576,15 +1578,15 @@ func (h *Handlers) CheckVouchers(ctx context.Context, sym string, input []byte)
 	data := common.ProcessVouchers(vouchersResp)
 
 	// Store all voucher data
-	dataMap := map[string]string{
-		"sym":  data.Symbols,
-		"bal":  data.Balances,
-		"deci": data.Decimals,
-		"addr": data.Addresses,
+	dataMap := map[common.DataTyp]string{
+		common.DATA_VOUCHER_SYMBOLS:   data.Symbols,
+		common.DATA_VOUCHER_BALANCES:  data.Balances,
+		common.DATA_VOUCHER_DECIMALS:  data.Decimals,
+		common.DATA_VOUCHER_ADDRESSES: data.Addresses,
 	}
 
 	for key, value := range dataMap {
-		if err := h.prefixDb.Put(ctx, []byte(key), []byte(value)); err != nil {
+		if err := h.prefixDb.Put(ctx, []byte(common.ToBytes(key)), []byte(value)); err != nil {
 			return res, nil
 		}
 	}
@@ -1597,7 +1599,7 @@ func (h *Handlers) GetVoucherList(ctx context.Context, sym string, input []byte)
 	var res resource.Result
 
 	// Read vouchers from the store
-	voucherData, err := h.prefixDb.Get(ctx, []byte("sym"))
+	voucherData, err := h.prefixDb.Get(ctx, common.ToBytes(common.DATA_VOUCHER_SYMBOLS))
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to read the voucherData from prefixDb", "error", err)
 		return res, err
@@ -1743,19 +1745,19 @@ func (h *Handlers) CheckTransactions(ctx context.Context, sym string, input []by
 	data := common.ProcessTransfers(transactionsResp)
 
 	// Store all transaction data
-	dataMap := map[string]string{
-		"txfrom": data.Senders,
-		"txto":   data.Recipients,
-		"txval":  data.TransferValues,
-		"txaddr": data.Addresses,
-		"txhash": data.TxHashes,
-		"txdate": data.Dates,
-		"txsym":  data.Symbols,
-		"txdeci": data.Decimals,
+	dataMap := map[common.DataTyp]string{
+		common.DATA_TX_SENDERS:    data.Senders,
+		common.DATA_TX_RECIPIENTS: data.Recipients,
+		common.DATA_TX_VALUES:     data.TransferValues,
+		common.DATA_TX_ADDRESSES:  data.Addresses,
+		common.DATA_TX_HASHES:     data.TxHashes,
+		common.DATA_TX_DATES:      data.Dates,
+		common.DATA_TX_SYMBOLS:    data.Symbols,
+		common.DATA_TX_DECIMALS:   data.Decimals,
 	}
 
 	for key, value := range dataMap {
-		if err := h.prefixDb.Put(ctx, []byte(key), []byte(value)); err != nil {
+		if err := h.prefixDb.Put(ctx, []byte(common.ToBytes(key)), []byte(value)); err != nil {
 			logg.ErrorCtxf(ctx, "failed to write to prefixDb", "error", err)
 			return res, err
 		}
@@ -1781,22 +1783,22 @@ func (h *Handlers) GetTransactionsList(ctx context.Context, sym string, input []
 	}
 
 	// Read transactions from the store and format them
-	TransactionSenders, err := h.prefixDb.Get(ctx, []byte("txfrom"))
+	TransactionSenders, err := h.prefixDb.Get(ctx, common.ToBytes(common.DATA_TX_SENDERS))
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to read the TransactionSenders from prefixDb", "error", err)
 		return res, err
 	}
-	TransactionSyms, err := h.prefixDb.Get(ctx, []byte("txsym"))
+	TransactionSyms, err := h.prefixDb.Get(ctx, common.ToBytes(common.DATA_TX_SYMBOLS))
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to read the TransactionSyms from prefixDb", "error", err)
 		return res, err
 	}
-	TransactionValues, err := h.prefixDb.Get(ctx, []byte("txval"))
+	TransactionValues, err := h.prefixDb.Get(ctx, common.ToBytes(common.DATA_TX_VALUES))
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to read the TransactionValues from prefixDb", "error", err)
 		return res, err
 	}
-	TransactionDates, err := h.prefixDb.Get(ctx, []byte("txdate"))
+	TransactionDates, err := h.prefixDb.Get(ctx, common.ToBytes(common.DATA_TX_DATES))
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to read the TransactionDates from prefixDb", "error", err)
 		return res, err
diff --git a/internal/handlers/ussd/menuhandler_test.go b/internal/handlers/ussd/menuhandler_test.go
index d7cd855..fac95a1 100644
--- a/internal/handlers/ussd/menuhandler_test.go
+++ b/internal/handlers/ussd/menuhandler_test.go
@@ -22,6 +22,7 @@ import (
 	testdataloader "github.com/peteole/testdata-loader"
 	"github.com/stretchr/testify/require"
 
+	visedb "git.defalsify.org/vise.git/db"
 	memdb "git.defalsify.org/vise.git/db/mem"
 	dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
 )
@@ -56,7 +57,8 @@ func InitializeTestSubPrefixDb(t *testing.T, ctx context.Context) *storage.SubPr
 	if err != nil {
 		t.Fatal(err)
 	}
-	spdb := storage.NewSubPrefixDb(db, []byte("vouchers"))
+	prefix := common.ToBytes(visedb.DATATYPE_USERDATA)
+	spdb := storage.NewSubPrefixDb(db, prefix)
 
 	return spdb
 }
@@ -1937,7 +1939,7 @@ func TestCheckVouchers(t *testing.T) {
 	assert.NoError(t, err)
 
 	// Read voucher sym data from the store
-	voucherData, err := spdb.Get(ctx, []byte("sym"))
+	voucherData, err := spdb.Get(ctx, common.ToBytes(common.DATA_VOUCHER_SYMBOLS))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1961,7 +1963,7 @@ func TestGetVoucherList(t *testing.T) {
 	expectedSym := []byte("1:SRF\n2:MILO")
 
 	// Put voucher sym data from the store
-	err := spdb.Put(ctx, []byte("sym"), expectedSym)
+	err := spdb.Put(ctx, common.ToBytes(common.DATA_VOUCHER_SYMBOLS), expectedSym)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1991,16 +1993,16 @@ func TestViewVoucher(t *testing.T) {
 	}
 
 	// Define mock voucher data
-	mockData := map[string][]byte{
-		"sym":  []byte("1:SRF\n2:MILO"),
-		"bal":  []byte("1:100\n2:200"),
-		"deci": []byte("1:6\n2:4"),
-		"addr": []byte("1:0xd4c288865Ce\n2:0x41c188d63Qa"),
+	mockData := map[common.DataTyp][]byte{
+		common.DATA_VOUCHER_SYMBOLS:   []byte("1:SRF\n2:MILO"),
+		common.DATA_VOUCHER_BALANCES:  []byte("1:100\n2:200"),
+		common.DATA_VOUCHER_DECIMALS:  []byte("1:6\n2:4"),
+		common.DATA_VOUCHER_ADDRESSES: []byte("1:0xd4c288865Ce\n2:0x41c188d63Qa"),
 	}
 
 	// Put the data
 	for key, value := range mockData {
-		err = spdb.Put(ctx, []byte(key), []byte(value))
+		err = spdb.Put(ctx, []byte(common.ToBytes(key)), []byte(value))
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/internal/storage/db.go b/internal/storage/sub_prefix_db.go
similarity index 88%
rename from internal/storage/db.go
rename to internal/storage/sub_prefix_db.go
index 8c9ff35..457af78 100644
--- a/internal/storage/db.go
+++ b/internal/storage/sub_prefix_db.go
@@ -6,10 +6,6 @@ import (
 	"git.defalsify.org/vise.git/db"
 )
 
-const (
-	DATATYPE_USERSUB = 64
-)
-
 // PrefixDb interface abstracts the database operations.
 type PrefixDb interface {
 	Get(ctx context.Context, key []byte) ([]byte, error)
@@ -35,13 +31,13 @@ func (s *SubPrefixDb) toKey(k []byte) []byte {
 }
 
 func (s *SubPrefixDb) Get(ctx context.Context, key []byte) ([]byte, error) {
-	s.store.SetPrefix(DATATYPE_USERSUB)
+	s.store.SetPrefix(db.DATATYPE_USERDATA)
 	key = s.toKey(key)
 	return s.store.Get(ctx, key)
 }
 
 func (s *SubPrefixDb) Put(ctx context.Context, key []byte, val []byte) error {
-	s.store.SetPrefix(DATATYPE_USERSUB)
+	s.store.SetPrefix(db.DATATYPE_USERDATA)
 	key = s.toKey(key)
 	return s.store.Put(ctx, key, val)
 }
diff --git a/internal/storage/db_test.go b/internal/storage/sub_prefix_db_test.go
similarity index 100%
rename from internal/storage/db_test.go
rename to internal/storage/sub_prefix_db_test.go