diff --git a/core/model/response.go b/core/model/response.go
deleted file mode 100644
index 745b9f4..0000000
--- a/core/model/response.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package model
-
-import "github.com/google/uuid"
-
-type CreateNewCustomerResp struct {
-	CustomerId uuid.UUID `json:"customer_id"`
-}
-
-type GenerateSignupInterfaceResp struct {
-	SessionId     uuid.UUID `json:"session_id"`
-	UserInterface []int     `json:"user_interface"`
-}
-
-type SetNKodeResp struct {
-	UserInterface []int `json:"user_interface"`
-}
-
-type GetLoginInterfaceResp struct {
-	UserInterface []int `json:"user_interface"`
-}
diff --git a/core/model/post.go b/core/model/type.go
similarity index 66%
rename from core/model/post.go
rename to core/model/type.go
index 83f1a76..d2fea45 100644
--- a/core/model/post.go
+++ b/core/model/type.go
@@ -2,6 +2,10 @@ package model
 
 import "github.com/google/uuid"
 
+type SetNKodeResp struct {
+	UserInterface []int `json:"user_interface"`
+}
+
 type NewCustomerPost struct {
 	KeypadSize  KeypadSize  `json:"keypad_size"`
 	NKodePolicy NKodePolicy `json:"nkode_policy"`
@@ -38,3 +42,22 @@ type LoginPost struct {
 type RenewAttributesPost struct {
 	CustomerId uuid.UUID `json:"customer_id"`
 }
+
+type CreateNewCustomerResp struct {
+	CustomerId uuid.UUID `json:"customer_id"`
+}
+
+type GenerateSignupInterfaceResp struct {
+	SessionId     uuid.UUID `json:"session_id"`
+	UserInterface []int     `json:"user_interface"`
+}
+
+type GetLoginInterfaceResp struct {
+	UserInterface []int `json:"user_interface"`
+}
+
+type KeySelection []int
+type CustomerId uuid.UUID
+type SessionId uuid.UUID
+type Username string
+type UserInterface []int