AppleInsider:

An occasional promotion has been relaunched by Apple, providing those who added credit to their Apple ID an extra bonus amount on top. Purchases will add an extra 10% of credit on top for a fund addition, worth up to $200 in the United States, 200 GBP in the United Kingdom, and up to 300 euro in some European territories, with similar offers provided in a number of other markets.

The bonus will only be applied to one purchase, according to the terms of the offer, meaning it will only apply on the first top-up purchased since the offer’s introduction. The offer stands until April 3, 2020, with eligibility of users varying based on their account information and purchase history.

If you use this promotion, it’s basically getting free money. And who can’t use a bit of extra money?