In case of a Change Offer Upgrade(the new offer is more expensive than the original one), the customer is charged immediately and the remaining period is discounted from the new offer accepted.
In case of a Change Offer Downgrade (the new offer is cheaper than the original one), the new offer will be effective once the original one has expired.
If a user buys a 30 EUR monthly subscription on 1 January and updates to a yearly 200 EUR on 15th of January, we will upgrade to the yearly offer immediately and will discount 15 EUR that have not been spent from the previous offer.
In the downgrade case, if a user has bought a 3 month offer for 75 EUR and donwngrades to a monthly 30 EUR, we will start applying the new offer once the initial one has been fully consumed.
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