Overwrite the default success / error messages

For the actions new, edit, delete, you can overwrite the default notices with your own:

edit:
  params:
    messages:
      success: "Your movie has been updated"
      error: "Oops, an error occurred, and this was not saved."

Example: Suppose you wish to provide feedback to your user with ApiKey data stored in an autogenerated form field, then you can use: '{$Model.getApiKey}' where $Model is your model short name object and getApiKey is the getter for the data.
Now include this in the success message.

edit:
  params:
    messages:
      success: "You've just registered a new application, thanks. Your consumer key is <u>{$Model->getApiKey()}</u>."

Warning
Don't forget the curly brackets {$Model->getWhatever()}.