diff --git a/src/domain/user/credential_type.rs b/src/domain/user/credential_type.rs
new file mode 100644
index 0000000..bfcf47e
--- /dev/null
+++ b/src/domain/user/credential_type.rs
@@ -0,0 +1,30 @@
+use std::fmt::Display;
+use serde::{Serialize, Deserialize};
+
+#[derive(Serialize, Deserialize, Debug)]
+pub enum CredentialType {
+    PhoneNumber,
+    Email
+}
+impl CredentialType {
+    pub fn get_max_length(&self) -> i32 {
+        match self {
+            CredentialType::PhoneNumber => 10,
+            CredentialType::Email => 255,
+        }
+    }
+    pub fn get_regex_pattern(&self) -> &str {
+        match self {
+            CredentialType::PhoneNumber => "REGEX PATTERN FOR PHONE NUMBER",
+            CredentialType::Email => "REGEX PATTERN FOR EMAIL",
+        }
+    }
+}
+impl Display for CredentialType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            CredentialType::Email => f.write_str("Email"),
+            CredentialType::PhoneNumber => f.write_str("PhoneNumber")
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/domain/user/mod.rs b/src/domain/user/mod.rs
index 05e678b..baa2b4c 100644
--- a/src/domain/user/mod.rs
+++ b/src/domain/user/mod.rs
@@ -1,2 +1,3 @@
 pub mod token;
-pub mod user;
\ No newline at end of file
+pub mod user;
+pub mod credential_type;
\ No newline at end of file
diff --git a/src/domain/user/user.rs b/src/domain/user/user.rs
index 0417d4d..6351e80 100644
--- a/src/domain/user/user.rs
+++ b/src/domain/user/user.rs
@@ -11,7 +11,8 @@ pub struct User{
     #[serde(skip_serializing_if = "Option::is_none")]
     pub last_updated: Option<NaiveDateTime>,
     pub app: String,
-    pub email: String,
+    pub credential: String,
+    pub credential_type: String,
     pub name: String,
     #[serde(skip_serializing)]
     pub password: String,
@@ -24,7 +25,8 @@ impl User {
             time_created: None, //  This will be automatically generated from the database
             last_updated: None, //  This will be automatically generated from the database
             app: "".to_string(),
-            email: "".to_string(),
+            credential: "".to_string(),
+            credential_type: "".to_string(),
             name:"".to_string(),
             password:"".to_string(),
             salt: "".to_string() }
@@ -34,7 +36,8 @@ impl User {
             time_created: None, //  This will be automatically generated from the database
             last_updated: None, //  This will be automatically generated from the database
             app: incoming_user.app.to_string(),
-            email: incoming_user.email.to_string(),
+            credential: incoming_user.credential.to_string(),
+            credential_type: incoming_user.credential_type.to_string(),
             name: incoming_user.name.to_string(),
             password: incoming_user.password.to_string(),
             salt: "".to_string() }
diff --git a/src/dtos/user/user_dtos.rs b/src/dtos/user/user_dtos.rs
index dbf2475..3cd4e60 100644
--- a/src/dtos/user/user_dtos.rs
+++ b/src/dtos/user/user_dtos.rs
@@ -1,10 +1,13 @@
 use serde::{Serialize, Deserialize};
 
+use crate::domain::user::credential_type::CredentialType;
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct UserForCreationDto{
     #[serde(default = "get_default_app")]
     pub app: String,
-    pub email: String,
+    pub credential: String,
+    pub credential_type: CredentialType,
     pub password: String,
     pub name: String
 }
@@ -12,14 +15,15 @@ pub struct UserForCreationDto{
 pub struct UserForLoginDto{
     #[serde(default = "get_default_app")]
     pub app: String,
-    pub email: String,
+    pub credential: String,
+    pub credential_type: CredentialType,
     pub password: String
 }
 #[derive(Serialize, Deserialize, Debug)]
 pub struct UserForAuthenticationDto{
     #[serde(default = "get_default_app")]
     pub app: String,
-    pub email: String,
+    pub id: String,
     pub token: String
 }