Flutter: get different plans from subscription

Question

I have one subscription with 2 plans:

The IDs I have created in Flutter are these:

const List<String> _androidProductIds = <String>[
  'plus',
  'pro',
  'basic', // this is the one
];

I have tried adding basic-month and basic-year but I only get the first one. How could I choose between plans within the same subscription?