diff --git a/internal/api/client.go b/internal/api/client.go
index 21eb2ff..4c01d78 100644
--- a/internal/api/client.go
+++ b/internal/api/client.go
@@ -11,16 +11,10 @@ import (
 )
 
 func (api *API) CreateClientHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	var body types.CreateClientRequestBody
@@ -33,7 +27,7 @@ func (api *API) CreateClientHandler(context echo.Context) error {
 		return err
 	}
 
-	client, err := api.db.CreateClient(id, body)
+	client, err := api.db.CreateClient(userId, body)
 
 	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating User!"}}
@@ -43,19 +37,13 @@ func (api *API) CreateClientHandler(context echo.Context) error {
 }
 
 func (api *API) GetAllClientsHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
-	if !ok {
+	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
-	id, err := uuid.Parse(userId)
-
-	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	clients, err := api.db.GetClients(id)
+	clients, err := api.db.GetClients(userId)
 
 	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting Clients!"}}
@@ -65,16 +53,10 @@ func (api *API) GetAllClientsHandler(context echo.Context) error {
 }
 
 func (api *API) GetClientHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -93,16 +75,10 @@ func (api *API) GetClientHandler(context echo.Context) error {
 }
 
 func (api *API) UpdateClientHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -137,16 +113,10 @@ func (api *API) UpdateClientHandler(context echo.Context) error {
 }
 
 func (api *API) DeleteClientHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
diff --git a/internal/api/invoice.go b/internal/api/invoice.go
index 05ba381..b8914af 100644
--- a/internal/api/invoice.go
+++ b/internal/api/invoice.go
@@ -11,16 +11,10 @@ import (
 )
 
 func (api *API) CreateItemHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -45,16 +39,10 @@ func (api *API) CreateItemHandler(context echo.Context) error {
 }
 
 func (api *API) CreateInvoiceHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	var body types.CreateInvoiceRequestBody
@@ -67,7 +55,7 @@ func (api *API) CreateInvoiceHandler(context echo.Context) error {
 		return err
 	}
 
-	invoice, err := api.db.CreateInvoice(id, body)
+	invoice, err := api.db.CreateInvoice(userId, body)
 
 	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error creating Invoice!"}}
@@ -77,13 +65,19 @@ func (api *API) CreateInvoiceHandler(context echo.Context) error {
 }
 
 func (api *API) GetAllItemsHandler(context echo.Context) error {
+	userId, err := uuid.Parse(context.Get("id").(string))
+
+	if err != nil {
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
+	}
+
 	id, err := uuid.Parse(context.Param("id"))
 
 	if err != nil {
 		return types.Error{Code: http.StatusBadRequest, Messages: []string{"Invoice ID is required to get Items!"}}
 	}
 
-	items, err := api.db.GetItems(id)
+	items, err := api.db.GetItems(userId, id)
 
 	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Messages: []string{"Unexpected error getting Items!"}}
@@ -93,7 +87,13 @@ func (api *API) GetAllItemsHandler(context echo.Context) error {
 }
 
 func (api *API) GetAllInvoicesHandler(context echo.Context) error {
-	invoices, err := api.db.GetInvoices()
+	userId, err := uuid.Parse(context.Get("id").(string))
+
+	if err != nil {
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
+	}
+
+	invoices, err := api.db.GetInvoices(userId)
 
 	if err != nil {
 		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting Invoices!"}}
@@ -103,16 +103,10 @@ func (api *API) GetAllInvoicesHandler(context echo.Context) error {
 }
 
 func (api *API) GetItemHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -131,16 +125,10 @@ func (api *API) GetItemHandler(context echo.Context) error {
 }
 
 func (api *API) GetInvoiceHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -159,16 +147,10 @@ func (api *API) GetInvoiceHandler(context echo.Context) error {
 }
 
 func (api *API) UpdateItemHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -199,16 +181,10 @@ func (api *API) UpdateItemHandler(context echo.Context) error {
 }
 
 func (api *API) UpdateInvoiceHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -239,16 +215,10 @@ func (api *API) UpdateInvoiceHandler(context echo.Context) error {
 }
 
 func (api *API) DeleteItemHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
@@ -265,16 +235,10 @@ func (api *API) DeleteItemHandler(context echo.Context) error {
 }
 
 func (api *API) DeleteInvoiceHandler(context echo.Context) error {
-	userIdString, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	userId, err := uuid.Parse(userIdString)
+	userId, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	id, err := uuid.Parse(context.Param("id"))
diff --git a/internal/api/user.go b/internal/api/user.go
index 410c1b0..0e995d6 100644
--- a/internal/api/user.go
+++ b/internal/api/user.go
@@ -58,16 +58,10 @@ func (api *API) GetAllUsersHandler(context echo.Context) error {
 }
 
 func (api *API) GetUserHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error getting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error getting User!"}}
 	}
 
 	var user types.User
@@ -80,16 +74,10 @@ func (api *API) GetUserHandler(context echo.Context) error {
 }
 
 func (api *API) UpdateUserHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User!"}}
 	}
 
 	var body types.UpdateUserRequestBody
@@ -118,16 +106,10 @@ func (api *API) UpdateUserHandler(context echo.Context) error {
 }
 
 func (api *API) UpdateUserSecurityCredentialsHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User security credentials!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User security credentials!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User security credentials!"}}
 	}
 
 	var body types.UpdateUserSecurityCredentialsBody
@@ -150,16 +132,10 @@ func (api *API) UpdateUserSecurityCredentialsHandler(context echo.Context) error
 }
 
 func (api *API) UpdateUserLogoHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error updating User logo!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	var user types.User
@@ -234,16 +210,10 @@ func (api *API) UpdateUserLogoHandler(context echo.Context) error {
 }
 
 func (api *API) DeleteUserHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error updating User logo!"}}
 	}
 
 	if err := api.db.DeleteUser(id); err != nil {
@@ -254,16 +224,10 @@ func (api *API) DeleteUserHandler(context echo.Context) error {
 }
 
 func (api *API) DeleteUserLogoHandler(context echo.Context) error {
-	userId, ok := context.Get("id").(string)
-
-	if !ok {
-		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error deleting User logo!"}}
-	}
-
-	id, err := uuid.Parse(userId)
+	id, err := uuid.Parse(context.Get("id").(string))
 
 	if err != nil {
-		return types.Error{Code: http.StatusInternalServerError, Cause: err, Messages: []string{"Unexpected error deleting User logo!"}}
+		return types.Error{Code: http.StatusInternalServerError, Cause: errors.New("Session ID not found after authorization."), Messages: []string{"Unexpected error deleting User logo!"}}
 	}
 
 	var user types.User
diff --git a/internal/models/invoice.go b/internal/models/invoice.go
index 9d8069d..f19900b 100644
--- a/internal/models/invoice.go
+++ b/internal/models/invoice.go
@@ -16,6 +16,7 @@ func (db *DB) CreateItem(userId, invoiceId uuid.UUID, body types.CreateItemReque
 		Name:      body.Name,
 		Type:      body.Type,
 		Quantity:  body.Quantity,
+		Price:     body.Price,
 		Tax:       body.Tax,
 	}
 
@@ -135,6 +136,7 @@ func (db *DB) UpdateItem(userId, id uuid.UUID, body types.UpdateItemRequestBody,
 		Name:     body.Name,
 		Type:     body.Type,
 		Quantity: body.Quantity,
+		Price:    body.Price,
 		Tax:      body.Tax,
 	})
 
diff --git a/internal/models/user.go b/internal/models/user.go
index cd640de..7155298 100644
--- a/internal/models/user.go
+++ b/internal/models/user.go
@@ -13,6 +13,7 @@ func (db *DB) CreateUser(body types.CreateUserRequestBody) (types.User, error) {
 	user := types.User{
 		ID:         uuid.New().String(),
 		SessionID:  uuid.New().String(),
+		Username:   strings.ToLower(body.Username),
 		Name:       body.Name,
 		FiscalCode: body.FiscalCode,
 		Address:    body.Address,
@@ -81,6 +82,7 @@ func (db *DB) UpdateUser(id uuid.UUID, body types.UpdateUserRequestBody, user *t
 	}
 
 	result = db.instance.Model(user).Updates(types.User{
+		Username:   strings.ToLower(body.Username),
 		Name:       body.Name,
 		FiscalCode: body.FiscalCode,
 		Address:    body.Address,
@@ -88,7 +90,6 @@ func (db *DB) UpdateUser(id uuid.UUID, body types.UpdateUserRequestBody, user *t
 		Country:    body.Country,
 		Phone:      body.Phone,
 		Email:      body.Email,
-		Username:   strings.ToLower(body.Username),
 	})
 
 	if result.Error != nil {
diff --git a/internal/types/invoice.go b/internal/types/invoice.go
index e5cbaef..22f1d9d 100644
--- a/internal/types/invoice.go
+++ b/internal/types/invoice.go
@@ -78,16 +78,16 @@ type Invoice struct {
 type CreateItemRequestBody struct {
 	Name     string `json:"name" validate:"alpha,required"`
 	Type     string `json:"type" validate:"alpha,required"`
-	Price    uint32 `json:"price" validate:"number,required"`
 	Quantity uint32 `json:"quantity" validate:"number,required"`
+	Price    uint32 `json:"price" validate:"number,required"`
 	Tax      uint32 `json:"tax" validate:"number,omitempty"`
 }
 
 type UpdateItemRequestBody struct {
 	Name     string `json:"name" validate:"alpha,omitempty"`
 	Type     string `json:"type" validate:"alpha,omitempty"`
-	Price    uint32 `json:"price" validate:"number,omitempty"`
 	Quantity uint32 `json:"quantity" validate:"number,omitempty"`
+	Price    uint32 `json:"price" validate:"number,omitempty"`
 	Tax      uint32 `json:"tax" validate:"number,omitempty"`
 }