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app/src/main/java/com/ssb/simplitend/apputils/RetrofitHelper.java

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+package com.ssb.simplitend.apputils;
+
+import java.io.IOException;
+
+import okhttp3.Interceptor;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+public abstract class RetrofitHelper {
+
+    // urls
+    public static final String BASE_URL = "https://simplitend.betadelivery.com/";
+
+    public static final String REGISTER_PATIENT = "api/auth/patient-register";
+
+    public static final String GET_CONTACT_LIST = "api/patients-contact-list";
+
+    // util functions
+
+    private static Retrofit retrofit;
+
+    public static synchronized Retrofit getRetrofit(){
+        if (retrofit == null){
+            retrofit = new Retrofit.Builder()
+                    .baseUrl(BASE_URL)
+                    .addConverterFactory(GsonConverterFactory.create())
+                    .client(new OkHttpClient.Builder()
+                            .addInterceptor(chain -> {
+                                Request request = chain.request().newBuilder()
+                                        .addHeader("Accept", "*/*")
+                                        .addHeader("Accept-Encoding", "gzip, deflate, br")
+                                        .addHeader("Connection", "keep-alive")
+                                        .addHeader("Content-Type", "multipart/form-data")
+                                        .build();
+                                return chain.proceed(request);
+                            }).build())
+                    .build();
+        }
+
+        return retrofit;
+    }
+
+}