diff --git a/example/pubspec.lock b/example/pubspec.lock
index af88bc2..0ac0744 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -5,49 +5,56 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.9.0"
+    version: "2.11.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.2.1"
+    version: "1.3.0"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.dartlang.org"
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: f092b211a4319e98e5ff58223576de6c2803db36221657b46c82574721240687
+      url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.2"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
-      url: "https://pub.dartlang.org"
+      sha256: "1989d917fbe8e6b39806207df5a3fdd3d816cbd090fac2ce26fb45e9a71476e5"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.4"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.dartlang.org"
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
   flutter:
@@ -59,7 +66,8 @@ packages:
     dependency: transitive
     description:
       name: flutter_inappwebview
-      url: "https://pub.dartlang.org"
+      sha256: "5cfdfe79aaf4753626d1e46772c9d7feee74e5cff66da000e098c29b9a8d61e1"
+      url: "https://pub.dev"
     source: hosted
     version: "5.3.2"
   flutter_test:
@@ -72,60 +80,60 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  js:
-    dependency: transitive
-    description:
-      name: js
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.6.4"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.12.12"
+    version: "0.12.16"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.dartlang.org"
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.1.5"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.1"
   nested:
     dependency: transitive
     description:
       name: nested
-      url: "https://pub.dartlang.org"
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.3"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
-      url: "https://pub.dartlang.org"
+      sha256: "075f927ebbab4262ace8d0b283929ac5410c0ac4e7fc123c76429564facfb757"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
   provider:
     dependency: transitive
     description:
       name: provider
-      url: "https://pub.dartlang.org"
+      sha256: "7896193cf752c40ba7f7732a95264319a787871e5d628225357f5c909182bc06"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.2"
   seerbit_flutter:
@@ -134,7 +142,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.0.4+4"
+    version: "0.0.4+6"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -144,107 +152,130 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.9.0"
+    version: "1.10.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.11.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.1.1"
+    version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.4.12"
+    version: "0.6.0"
   url_launcher:
     dependency: transitive
     description:
       name: url_launcher
-      url: "https://pub.dartlang.org"
+      sha256: "236e5ad4df2dabb79ce5d0f1aafb4cb70c0ad6dc93f88e610ad31c8fef74f477"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.18"
   url_launcher_android:
     dependency: transitive
     description:
       name: url_launcher_android
-      url: "https://pub.dartlang.org"
+      sha256: "2ec66333093cf5dd5103f089c3a7842fcd5581023a571839d3d176ff10244582"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.14"
   url_launcher_ios:
     dependency: transitive
     description:
       name: url_launcher_ios
-      url: "https://pub.dartlang.org"
+      sha256: "0d6b0b9dce05986462e8ba08e51f1909ac63e2e59ebde829c46ad66423f03dee"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.14"
   url_launcher_linux:
     dependency: transitive
     description:
       name: url_launcher_linux
-      url: "https://pub.dartlang.org"
+      sha256: ae3c5ce30a1ba0a69c3f8803b23450703cf915575ad591857df98d9c15c11018
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
   url_launcher_macos:
     dependency: transitive
     description:
       name: url_launcher_macos
-      url: "https://pub.dartlang.org"
+      sha256: "8fd9ae3ab5e0f96cea7dd66c4ea65e39e3477067f4997c1ec8225d553e8bb8ea"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
   url_launcher_platform_interface:
     dependency: transitive
     description:
       name: url_launcher_platform_interface
-      url: "https://pub.dartlang.org"
+      sha256: "1b9c4dab07794498b83b5f938e26b20f68c3b460a3015b0307f9541cb34ef93d"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.5"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
-      url: "https://pub.dartlang.org"
+      sha256: "88de707cba8e0c1c678ed79274298c4737f7f24addd12e786fbf0597de085850"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.6"
   url_launcher_windows:
     dependency: transitive
     description:
       name: url_launcher_windows
-      url: "https://pub.dartlang.org"
+      sha256: "4e24aac2a2960fb9a70a07992e1ba69cb99fbcee48fdf17abe280ce867bfcea2"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.2"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.4-beta"
 sdks:
-  dart: ">=2.17.0-0 <3.0.0"
+  dart: ">=3.1.0-185.0.dev <3.3.10"
   flutter: ">=2.5.0"
diff --git a/lib/new/req.dart b/lib/new/req.dart
index bfd991d..825cab7 100644
--- a/lib/new/req.dart
+++ b/lib/new/req.dart
@@ -18,6 +18,8 @@ String initRequest(
     paymentMethods
         .addAll(List.generate(5 - paymentMethods.length, (index) => ""));
   }
+  String planIdString =
+      model.planId == null ? '"planId": ""' : '"planId": "${model.planId}"';
 
   return """
                                   <!DOCTYPE html>
@@ -52,7 +54,7 @@ String initRequest(
                                   "report_link":"${state.reportLink}",
                                   public_key: "${model.publicKey}",
                                    tokenize: ${model.tokenize},
-                                   planId: "${model.planId}", 
+                                    $planIdString, 
                                    customization: {
                                       theme: {
                                         border_color: "${model.customization.borderColor}",
diff --git a/pubspec.lock b/pubspec.lock
index 0e6c00b..142bf32 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -5,42 +5,48 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.9.0"
+    version: "2.11.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.2.1"
+    version: "1.3.0"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.dartlang.org"
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: f092b211a4319e98e5ff58223576de6c2803db36221657b46c82574721240687
+      url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.2"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.dartlang.org"
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
   flutter:
@@ -52,7 +58,8 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_inappwebview
-      url: "https://pub.dartlang.org"
+      sha256: "5cfdfe79aaf4753626d1e46772c9d7feee74e5cff66da000e098c29b9a8d61e1"
+      url: "https://pub.dev"
     source: hosted
     version: "5.3.2"
   flutter_test:
@@ -65,60 +72,60 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  js:
-    dependency: transitive
-    description:
-      name: js
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.6.4"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.12.12"
+    version: "0.12.16"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      url: "https://pub.dartlang.org"
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.1.5"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.1"
   nested:
     dependency: transitive
     description:
       name: nested
-      url: "https://pub.dartlang.org"
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.3"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
-      url: "https://pub.dartlang.org"
+      sha256: "075f927ebbab4262ace8d0b283929ac5410c0ac4e7fc123c76429564facfb757"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
   provider:
     dependency: "direct main"
     description:
       name: provider
-      url: "https://pub.dartlang.org"
+      sha256: "7896193cf752c40ba7f7732a95264319a787871e5d628225357f5c909182bc06"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.2"
   sky_engine:
@@ -130,107 +137,130 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.9.0"
+    version: "1.10.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.11.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
     source: hosted
-    version: "1.1.1"
+    version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
+      url: "https://pub.dev"
     source: hosted
-    version: "0.4.12"
+    version: "0.6.0"
   url_launcher:
     dependency: "direct main"
     description:
       name: url_launcher
-      url: "https://pub.dartlang.org"
+      sha256: "236e5ad4df2dabb79ce5d0f1aafb4cb70c0ad6dc93f88e610ad31c8fef74f477"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.18"
   url_launcher_android:
     dependency: transitive
     description:
       name: url_launcher_android
-      url: "https://pub.dartlang.org"
+      sha256: "2ec66333093cf5dd5103f089c3a7842fcd5581023a571839d3d176ff10244582"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.14"
   url_launcher_ios:
     dependency: transitive
     description:
       name: url_launcher_ios
-      url: "https://pub.dartlang.org"
+      sha256: "0d6b0b9dce05986462e8ba08e51f1909ac63e2e59ebde829c46ad66423f03dee"
+      url: "https://pub.dev"
     source: hosted
     version: "6.0.14"
   url_launcher_linux:
     dependency: transitive
     description:
       name: url_launcher_linux
-      url: "https://pub.dartlang.org"
+      sha256: ae3c5ce30a1ba0a69c3f8803b23450703cf915575ad591857df98d9c15c11018
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
   url_launcher_macos:
     dependency: transitive
     description:
       name: url_launcher_macos
-      url: "https://pub.dartlang.org"
+      sha256: "8fd9ae3ab5e0f96cea7dd66c4ea65e39e3477067f4997c1ec8225d553e8bb8ea"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
   url_launcher_platform_interface:
     dependency: transitive
     description:
       name: url_launcher_platform_interface
-      url: "https://pub.dartlang.org"
+      sha256: "1b9c4dab07794498b83b5f938e26b20f68c3b460a3015b0307f9541cb34ef93d"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.5"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
-      url: "https://pub.dartlang.org"
+      sha256: "88de707cba8e0c1c678ed79274298c4737f7f24addd12e786fbf0597de085850"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.6"
   url_launcher_windows:
     dependency: transitive
     description:
       name: url_launcher_windows
-      url: "https://pub.dartlang.org"
+      sha256: "4e24aac2a2960fb9a70a07992e1ba69cb99fbcee48fdf17abe280ce867bfcea2"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.2"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.4-beta"
 sdks:
-  dart: ">=2.17.0-0 <3.0.0"
+  dart: ">=3.1.0-185.0.dev <3.3.10"
   flutter: ">=2.5.0"