Definition of 

Upgrade From Introductory Offer

What's 
Upgrade From Introductory Offer
: it is one of the possible values for
Event
. It means:
When a customer switches from an introductory offer subscription in a lower level to a standard price subscription in a higher level. The introductory price ends immediately and the customer’s prorated amount from the prior in-app purchase is refunded to the original payment method. The new in-app purchase is charged and goes into effect immediately at the full price, which changes the customer’s renewal date to the upgrade date.

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Trends: Subscriptions Events

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