Make userAuthenticationEmail optional for app-switch related flows

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Braintree Android SDK Release Notes
 
+## unreleased
+
+* PayPal
+  * Make `PayPalCheckoutRequest.userAuthenticationEmail` optional for App Switch flows
+
 ## 5.8.0 (2025-03-06)
 
 * All Modules

PayPal/src/main/java/com/braintreepayments/api/paypal/PayPalCheckoutRequest.kt

@@ -153,7 +153,7 @@ class PayPalCheckoutRequest @JvmOverloads constructor(
             }
         }
 
-        if (enablePayPalAppSwitch && !appLink.isNullOrEmpty() && !userAuthenticationEmail.isNullOrEmpty()) {
+        if (enablePayPalAppSwitch && !appLink.isNullOrEmpty()) {
             parameters.put(ENABLE_APP_SWITCH_KEY, enablePayPalAppSwitch)
             parameters.put(OS_VERSION_KEY, Build.VERSION.SDK_INT.toString())
             parameters.put(OS_TYPE_KEY, "Android")

PayPal/src/main/java/com/braintreepayments/api/paypal/PayPalVaultRequest.kt

@@ -98,7 +98,7 @@ class PayPalVaultRequest
 
         userPhoneNumber?.let { parameters.put(PHONE_NUMBER_KEY, it.toJson()) }
 
-        if (enablePayPalAppSwitch && !appLink.isNullOrEmpty() && !userAuthenticationEmail.isNullOrEmpty()) {
+        if (enablePayPalAppSwitch && !appLink.isNullOrEmpty()) {
             parameters.put(ENABLE_APP_SWITCH_KEY, enablePayPalAppSwitch)
             parameters.put(OS_VERSION_KEY, Build.VERSION.SDK_INT.toString())
             parameters.put(OS_TYPE_KEY, "Android")

PayPal/src/test/java/com/braintreepayments/api/paypal/PayPalCheckoutRequestUnitTest.java

@@ -192,6 +192,30 @@ public void createRequestBody_sets_shippingCallbackUri_when_not_null() throws JS
         assertEquals(urlString, jsonObject.getString("shipping_callback_url"));
     }
 
+    @Test
+    public void createRequestBody_sets_appSwitchParameters_irrespectiveOf_userAuthenticationEmail_emptyOrNot(
+        @TestParameter({"", "[email protected]"}) String payerEmail
+    ) throws JSONException {
+        PayPalCheckoutRequest request = new PayPalCheckoutRequest("1.00", true);
+        request.setEnablePayPalAppSwitch(true);
+        request.setUserAuthenticationEmail(payerEmail);
+        String appLink = "universal_url";
+
+        String requestBody = request.createRequestBody(
+                mock(Configuration.class),
+                mock(Authorization.class),
+                "success_url",
+                "cancel_url",
+                appLink
+        );
+
+        JSONObject jsonObject = new JSONObject(requestBody);
+        assertTrue(jsonObject.getBoolean("launch_paypal_app"));
+        assertEquals("Android", jsonObject.getString("os_type"));
+        assertEquals(appLink, jsonObject.getString("merchant_app_return_url"));
+        assertNotNull(jsonObject.getString("os_version"));
+    }
+
     @Test
     public void createRequestBody_sets_shopper_insights_session_id() throws JSONException {
         PayPalCheckoutRequest request = new PayPalCheckoutRequest("1.00", true);

PayPal/src/test/java/com/braintreepayments/api/paypal/PayPalVaultRequestUnitTest.java

@@ -1,32 +1,34 @@
 package com.braintreepayments.api.paypal;
 
-import static junit.framework.Assert.assertEquals;
-import static junit.framework.Assert.assertFalse;
-import static junit.framework.Assert.assertNull;
-import static junit.framework.Assert.assertTrue;
-import static org.junit.Assert.assertSame;
-import static org.mockito.Mockito.mock;
-
 import android.os.Build;
 import android.os.Parcel;
 
 import com.braintreepayments.api.core.Authorization;
 import com.braintreepayments.api.core.Configuration;
 import com.braintreepayments.api.core.PostalAddress;
 import com.braintreepayments.api.testutils.Fixtures;
+import com.google.testing.junit.testparameterinjector.TestParameter;
 
 import org.json.JSONException;
-import org.junit.Assert;
+import org.json.JSONObject;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RobolectricTestParameterInjector;
 import org.skyscreamer.jsonassert.JSONAssert;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 
-@RunWith(RobolectricTestRunner.class)
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertNull;
+import static junit.framework.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertSame;
+import static org.mockito.Mockito.mock;
+
+@RunWith(RobolectricTestParameterInjector.class)
 public class PayPalVaultRequestUnitTest {
 
     @Test
@@ -303,6 +305,30 @@ public void createRequestBody_correctlyFormatsJSON() throws JSONException {
         JSONAssert.assertEquals(Fixtures.PAYPAL_REQUEST_JSON, requestBody, false);
     }
 
+    @Test
+    public void createRequestBody_sets_appSwitchParameters_irrespectiveOf_userAuthenticationEmail_emptyOrNot(
+        @TestParameter({"", "[email protected]"}) String payerEmail
+    ) throws JSONException {
+        PayPalVaultRequest request = new PayPalVaultRequest( true);
+        request.setEnablePayPalAppSwitch(true);
+        request.setUserAuthenticationEmail(payerEmail);
+        String appLink = "universal_url";
+
+        String requestBody = request.createRequestBody(
+                mock(Configuration.class),
+                mock(Authorization.class),
+                "success_url",
+                "cancel_url",
+                appLink
+        );
+
+        JSONObject jsonObject = new JSONObject(requestBody);
+        assertTrue(jsonObject.getBoolean("launch_paypal_app"));
+        assertEquals("Android", jsonObject.getString("os_type"));
+        assertEquals(appLink, jsonObject.getString("merchant_app_return_url"));
+        assertNotNull(jsonObject.getString("os_version"));
+    }
+
     @Test
     public void createRequestBody_sets_userPhoneNumber_when_not_null() throws JSONException {
         PayPalVaultRequest request = new PayPalVaultRequest(true);