Free trial is a discount method that can be used in Introductory offers, promotional offers, and promotion codes, and it is not necessarily to use in promotional offers. Going further, is there a way to judge whether the offer is Pay as you go, Pay up front, or free trial?

In notification version1, there is an field called is_trial_period, is useful for us to identify this transaction is in free trial, and we can judge the user's payment status and recomand some feature for him. but, in notification version2 the filed is not appear, in this scenari, how can I identify this user is in free trial period ?