diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fc2cb02..cf82b15 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -5,6 +5,7 @@
 
     <uses-permission android:name="android.permission.NFC" />
     <uses-feature android:name="android.hardware.nfc" android:required="true" />
+    <uses-permission android:name="android.permission.INTERNET" />
 
     <application
         android:allowBackup="true"
@@ -15,6 +16,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Palto"
+        android:usesCleartextTraffic="true"
         tools:targetApi="31">
         <activity
             android:name=".PaltoActivity"
diff --git a/app/src/main/java/com/example/palto/data/Result.kt b/app/src/main/java/com/example/palto/data/Result.kt
deleted file mode 100644
index be27f93..0000000
--- a/app/src/main/java/com/example/palto/data/Result.kt
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.example.palto.data
-
-/**
- * A generic class that holds a value with its loading status.
- * @param <T>
- */
-sealed class Result<out T : Any> {
-
-    data class Success<out T : Any>(val data: T) : Result<T>()
-    data class Error(val exception: Exception) : Result<Nothing>()
-
-    override fun toString(): String {
-        return when (this) {
-            is Success<*> -> "Success[data=$data]"
-            is Error -> "Error[exception=$exception]"
-        }
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/palto/data/network/PaltoApiService.kt b/app/src/main/java/com/example/palto/data/network/PaltoApiService.kt
new file mode 100644
index 0000000..21cde23
--- /dev/null
+++ b/app/src/main/java/com/example/palto/data/network/PaltoApiService.kt
@@ -0,0 +1,46 @@
+package com.example.palto.data.network
+
+import com.example.palto.data.network.model.UserCredentials
+import com.example.palto.domain.Tokens
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+import retrofit2.Retrofit
+import retrofit2.converter.moshi.MoshiConverterFactory
+import retrofit2.http.Body
+import retrofit2.http.POST
+
+/**
+ * A public Api object that exposes the lazy-initialized Retrofit service
+ */
+object PaltoApi {
+
+    // Build the Moshi object that Retrofit will be using, making sure to add the Kotlin adapter for
+    // full Kotlin compatibility.
+    private val moshi = Moshi.Builder()
+        .add(KotlinJsonAdapterFactory())
+        .build()
+
+    fun createService(url: String) {
+        // Use the Retrofit builder to build a retrofit object using a Moshi converter
+        // with our Moshi object.
+        val retrofit = Retrofit.Builder()
+            .addConverterFactory(MoshiConverterFactory.create(moshi))
+            .baseUrl(url)
+            .build()
+        retrofitService = retrofit.create(PaltoApiService::class.java)
+    }
+
+    // Retrofit service that Palto will use to do requests.
+    // Make sure to call createService once before using it.
+    lateinit var retrofitService: PaltoApiService
+}
+
+
+/**
+ * Functions to query the API.
+ */
+interface PaltoApiService {
+
+    @POST("api/auth/jwt/token/")
+    suspend fun getTokens(@Body userCredentials: UserCredentials): Tokens
+}
diff --git a/app/src/main/java/com/example/palto/data/network/ServerDataSource.kt b/app/src/main/java/com/example/palto/data/network/ServerDataSource.kt
deleted file mode 100644
index 8c68892..0000000
--- a/app/src/main/java/com/example/palto/data/network/ServerDataSource.kt
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.example.palto.data.network
-
-import com.example.palto.data.Result
-import com.example.palto.model.LoggedInUser
-import com.example.palto.model.Tokens
-import java.io.IOException
-import java.util.UUID
-
-/**
- * Class that handles API calls.
- */
-class ServerDataSource {
-
-    private var hostname: String? = null
-
-    fun requestToken(
-        hostname: String,
-        username: String,
-        password: String
-    ): Result<Tokens> {
-        try {
-            val tokens = Tokens(
-                refresh = "aa",
-                access = "bb"
-            )
-            return Result.Success(tokens)
-        } catch (e: Throwable) {
-            return Result.Error(IOException("Error logging in", e))
-        }
-    }
-
-    fun refreshToken(current_tokens: Tokens): Result<Tokens> {
-        return Result.Success(current_tokens)
-    }
-
-    fun verifyToken(): Boolean {
-        return true
-    }
-
-    fun login(
-        hostname: String,
-        username: String,
-        password: String
-    ): Result<LoggedInUser> {
-        try {
-            val fakeUser = LoggedInUser(
-                UUID.randomUUID().toString(),
-                "dede",
-                "Lucie",
-                "Doe",
-                "aa@free.fr",
-                )
-            return Result.Success(fakeUser)
-        } catch (e: Throwable) {
-            return Result.Error(IOException("Error logging in", e))
-        }
-    }
-
-    fun logout() { }
-}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/palto/data/network/model/UserCredentials.kt b/app/src/main/java/com/example/palto/data/network/model/UserCredentials.kt
new file mode 100644
index 0000000..50b3ffd
--- /dev/null
+++ b/app/src/main/java/com/example/palto/data/network/model/UserCredentials.kt
@@ -0,0 +1,6 @@
+package com.example.palto.data.network.model
+
+data class UserCredentials(
+    val username: String,
+    val password: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/palto/data/repository/TokenRepository.kt b/app/src/main/java/com/example/palto/data/repository/TokenRepository.kt
new file mode 100644
index 0000000..c1bb243
--- /dev/null
+++ b/app/src/main/java/com/example/palto/data/repository/TokenRepository.kt
@@ -0,0 +1,23 @@
+package com.example.palto.data.repository
+
+import com.example.palto.data.network.PaltoApi
+import com.example.palto.data.network.model.UserCredentials
+import com.example.palto.domain.Tokens
+
+/**
+ * Class that requests authentication tokens from Palto server.
+ */
+class TokenRepository() {
+
+    private var tokens: Tokens? = null
+
+    suspend fun authenticate(
+        hostname: String,
+        username: String,
+        password: String
+    ) {
+        PaltoApi.createService("http://$hostname:8000/")
+        val tokens = PaltoApi.retrofitService.getTokens((UserCredentials(username, password)))
+        this.tokens = tokens
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/palto/data/repository/TokensRepository.kt b/app/src/main/java/com/example/palto/data/repository/TokensRepository.kt
deleted file mode 100644
index 184f04c..0000000
--- a/app/src/main/java/com/example/palto/data/repository/TokensRepository.kt
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.example.palto.data.repository
-
-import com.example.palto.data.network.ServerDataSource
-import com.example.palto.model.Tokens
-
-/**
- * Class that requests authentication and user information from the remote data source and
- * maintains an in-memory cache of login status and user credentials information.
- */
-
-class TokensRepository(val dataSource: ServerDataSource) {
-
-    var tokens: Tokens? = null
-        private set
-
-    /*
-    val isLoggedIn: Boolean
-        get() = user != null
-     */
-
-    init {
-        // If user credentials will be cached in local storage, it is recommended it be encrypted
-        // @see https://developer.android.com/training/articles/keystore
-        tokens = null
-    }
-
-    /*
-    fun login(username: String, password: String): Result<LoggedInUser> {
-        // handle login
-        val result = dataSource.login(username, password)
-
-        if (result is Result.Success) {
-            setLoggedInUser(result.data)
-        }
-
-        return result
-    }
-    */
-
-    private fun setTokens(tokens: Tokens) {
-        this.tokens = tokens
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/palto/model/Tokens.kt b/app/src/main/java/com/example/palto/domain/Tokens.kt
similarity index 79%
rename from app/src/main/java/com/example/palto/model/Tokens.kt
rename to app/src/main/java/com/example/palto/domain/Tokens.kt
index fa90475..4e29846 100644
--- a/app/src/main/java/com/example/palto/model/Tokens.kt
+++ b/app/src/main/java/com/example/palto/domain/Tokens.kt
@@ -1,4 +1,4 @@
-package com.example.palto.model
+package com.example.palto.domain
 import java.io.Serializable
 
 /**
@@ -7,4 +7,4 @@ import java.io.Serializable
 data class Tokens(
     val refresh: String,
     val access: String
-) : Serializable
\ No newline at end of file
+)
\ No newline at end of file