Add platform device id package. Send device uuid to ionia for purchase request. (#494)

lib/ionia/ionia_api.dart

@@ -11,6 +11,7 @@ import 'package:cake_wallet/ionia/ionia_gift_card.dart';
 class IoniaApi {
 	static const baseUri = 'api.ionia.io';
 	static const pathPrefix = 'cake';
+	static const requestedUUIDHeader = 'requestedUUID';
 	static final createUserUri = Uri.https(baseUri, '/$pathPrefix/CreateUser');
 	static final verifyEmailUri = Uri.https(baseUri, '/$pathPrefix/VerifyEmail');
 	static final signInUri = Uri.https(baseUri, '/$pathPrefix/SignIn');
@@ -254,6 +255,7 @@ class IoniaApi {
 	// Purchase Gift Card
 
 	Future<IoniaOrder> purchaseGiftCard({
+		@required String requestedUUID,
 		@required String merchId,
 		@required double amount,
 		@required String currency,
@@ -264,6 +266,7 @@ class IoniaApi {
 			'clientId': clientId,
 			'username': username,
 			'password': password,
+			requestedUUIDHeader: requestedUUID,
 			'Content-Type': 'application/json'};
 		final body = <String, dynamic>{
 			'Amount': amount,

lib/ionia/ionia_service.dart

@@ -7,6 +7,7 @@ import 'package:cake_wallet/.secrets.g.dart' as secrets;
 import 'package:cake_wallet/ionia/ionia_api.dart';
 import 'package:cake_wallet/ionia/ionia_gift_card.dart';
 import 'package:cake_wallet/ionia/ionia_category.dart';
+import 'package:platform_device_id/platform_device_id.dart';
 
 class IoniaService {
 	IoniaService(this.secureStorage, this.ioniaApi);
@@ -114,7 +115,9 @@ class IoniaService {
 		@required String currency}) async {
 		final username = await secureStorage.read(key: ioniaUsernameStorageKey);
 		final password = await secureStorage.read(key: ioniaPasswordStorageKey);
+		final deviceId = await PlatformDeviceId.getDeviceId;
 		return ioniaApi.purchaseGiftCard(
+			requestedUUID: deviceId,
 			merchId: merchId,
 			amount: amount,
 			currency: currency,

lib/src/screens/ionia/cards/ionia_account_page.dart

@@ -124,7 +124,7 @@ class IoniaAccountPage extends BasePage {
           //),
           SizedBox(height: 40),
           Observer(
-            builder: (_) => IoniaTile(title: S.of(context).email_address, subTitle: ioniaAccountViewModel.email),
+            builder: (_) => IoniaTile(title: S.of(context).email_address, subTitle: ioniaAccountViewModel.email ?? ''),
           ),
           Divider()
         ],