authorize_net_plugin

• Fixed the Android build: migrated the plugin and the example app off the imperative Flutter Gradle apply (removed in current Flutter) to the declarative plugins block, moved to AGP 9 / Gradle 9, replaced dead jcenter() with mavenCentral(), and moved the namespace out of the manifests into build.gradle
• The AuthorizeNet Android SDK is now exposed as an api dependency, so apps no longer need to declare it themselves — only the jitpack repository is required
• cardCvv, zipCode and cardHolderName are now optional, matching the underlying Android and iOS SDKs where only the card number and expiration date are required. Empty strings are treated as omitted so the SDKs don't reject them during validation
• Annotated the authorizeNetToken parameters as String instead of leaving them dynamic
• Fixed the example app's sandbox apiLoginId, which had two stray characters and made every request fail with a generic E00001

• Fixed build error on Flutter 3.x: removed unused PluginRegistry.Registrar import that no longer exists in the v2 embedding API

• Updated Dart SDK constraints to support latest versions
• Updated Android compileSdkVersion and added namespace for compatibility with newer Android Gradle plugin
• Modernized test suite with improved coverage and updated to use TestDefaultBinaryMessengerBinding API

Fixed error handling

Up pub score

Migrate to null saftey

Update readme

This time it works...

• TODO: Describe initial release.