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dependencies {
    ...

    // Network
    implementation 'com.squareup.retrofit2:retrofit:2.7.1'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
    implementation 'com.squareup.okhttp3:okhttp:4.2.1'

    ...
}

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object Constants {

    // Endpoints
    const val BASE_URL = "https://baseurl.com/"
    const val LOGIN_URL = "auth/login"
    const val POSTS_URL = "posts"
    
}

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/**
 * Interface for defining REST request functions
 */
interface ApiService {
  
    @POST(Constants.LOGIN_URL)
    @FormUrlEncoded
    fun login(@Body request: LoginRequest): Call<LoginResponse>

}

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/**
 * Retrofit instance class
 */
class ApiClient {
    private lateinit var apiService: ApiService
    
    fun getApiService(): ApiService {
        
        // Initialize ApiService if not initialized yet
        if (!::apiService.isInitialized) {

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data class User (
    @SerializedName("id") 
    var id: String,
    
    @SerializedName("first_name")
    var firstName: String,
    
    @SerializedName("last_name")
    var lastName: String,
    

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data class LoginRequest (
    @SerializedName("email")
    var email: String,
    
    @SerializedName("password")
    var password: String
)

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data class LoginResponse (
    @SerializedName("status_code")
    var statusCode: Int,

    @SerializedName("auth_token")
    var authToken: String,

    @SerializedName("user")
    var user: User
)

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/**
 * Session manager to save and fetch data from SharedPreferences
 */
class SessionManager (context: Context) {
    private var prefs: SharedPreferences = context.getSharedPreferences(context.getString(R.string.app_name), Context.MODE_PRIVATE)
    
    companion object {
        const val USER_TOKEN = "user_token"
    }

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class LoginActivity : AppCompatActivity() {
    private lateinit var sessionManager: SessionManager
    private lateinit var apiClient: ApiClient

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)

        apiClient = ApiClient()
        sessionManager = SessionManager(this)

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data class Post (
    @SerializedName("id")
    var id: Int,
    
    @SerializedName("title")
    var title: String,
    
    @SerializedName("description")
    var description: String,