diff --git a/app/src/main/java/com/example/citrusclient/Citrus.java b/app/src/main/java/com/example/citrusclient/Citrus.java
new file mode 100644
index 0000000..f5577bb
--- /dev/null
+++ b/app/src/main/java/com/example/citrusclient/Citrus.java
@@ -0,0 +1,6 @@
+package com.example.citrusclient;
+
+import android.app.Application;
+
+public class Citrus extends Application {
+}
diff --git a/app/src/main/java/com/example/citrusclient/models/Book.java b/app/src/main/java/com/example/citrusclient/models/Book.java
new file mode 100644
index 0000000..f69ff74
--- /dev/null
+++ b/app/src/main/java/com/example/citrusclient/models/Book.java
@@ -0,0 +1,4 @@
+package com.example.citrusclient.models;
+
+public class Book {
+}
diff --git a/app/src/main/java/com/example/citrusclient/rest/AccountsRest.java b/app/src/main/java/com/example/citrusclient/rest/AccountsRest.java
index e6b84ff..0941f37 100644
--- a/app/src/main/java/com/example/citrusclient/rest/AccountsRest.java
+++ b/app/src/main/java/com/example/citrusclient/rest/AccountsRest.java
@@ -1,4 +1,30 @@
 package com.example.citrusclient.rest;
 
+import retrofit2.Call;
+import retrofit2.http.Field;
+import retrofit2.http.FormUrlEncoded;
+import retrofit2.http.POST;
+import retrofit2.http.Path;
+
 public interface AccountsRest {
+
+//    @FormUrlEncoded
+//    @GET("accounts")
+//    Call<Void> getAllAccounts(
+//
+//    );
+
+    @FormUrlEncoded
+    @POST("accounts")
+    Call<String> signup(
+            @Field("account_id") String account_id,
+            @Field("password") String password
+    );
+
+    @FormUrlEncoded
+    @POST("accounts/{account_id}/login")
+    Call<String> login(
+            @Path("account_id") String account_id,
+            @Field("password") String password
+    );
 }
diff --git a/app/src/main/java/com/example/citrusclient/rest/BooksRest.java b/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
index f09982e..53727ae 100644
--- a/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
+++ b/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
@@ -1,4 +1,29 @@
 package com.example.citrusclient.rest;
 
+import java.util.Collection;
+import java.util.HashMap;
+
+import retrofit2.Call;
+import retrofit2.Response;
+import retrofit2.http.DELETE;
+import retrofit2.http.Field;
+import retrofit2.http.FormUrlEncoded;
+import retrofit2.http.GET;
+import retrofit2.http.POST;
+import retrofit2.http.PUT;
+import retrofit2.http.Path;
+
 public interface BooksRest {
+
+    @GET("accounts/{account_id}/books")
+    Call<Void> getBooks(
+            @Path("account_id") String account_id
+    );
+
+    @FormUrlEncoded
+    @POST("accounts/{account_id}/books")
+    Call<Void> createBook(
+            @Path("account_id") String account_id
+
+    );
 }