Flutter using aws cognito via amplify
also see below. https://qiita.com/akiraabe/items/fbd85414be82fb85fc79
https://aws.amazon.com/jp/getting-started/hands-on/build-flutter-app-amplify/
also see below. https://qiita.com/akiraabe/items/fbd85414be82fb85fc79
https://aws.amazon.com/jp/getting-started/hands-on/build-flutter-app-amplify/