I mean it just number, I can guess a random number. Is that possible?

I feel like this notification(INTERACTIVE_RENEWAL) just tell us there are a new subscription is now active(is from non-active to active or from an active to another active). there are 2 situation: user coming back while an subscription expired user upgrade to another sku how can i seperate these 2 situation? I think i could check the previous receipt, while it's is_upgraded is true, indicate that it is from an active subscription upgrade to another. If is false, then should be reactivation

thanks for your reply, helps me a lot. But may I ask does there any api could return us the order of the product in subscription group?

So there are two kind of reason in this case: the user turning off auto renewal, indicating they don't want their payment method to be charged while the billing retry period is active system disabling auto-renewal at the end of the billing retry period And how can I recognized which one? Focus on the expiration_intent field, right?