6 classes are annotated with CommercePromotionOffer in Commerce Core 8.2

BuyXGetY in modules/promotion/src/Plugin/Commerce/PromotionOffer/BuyXGetY.php

Provides the "Buy X Get Y" offer for orders.

CombinationOffer in modules/promotion/src/Plugin/Commerce/PromotionOffer/CombinationOffer.php

Provides the 'combination_offer' offer plugin.

OrderFixedAmountOff in modules/promotion/src/Plugin/Commerce/PromotionOffer/OrderFixedAmountOff.php

Provides the fixed amount off offer for orders.

OrderItemFixedAmountOff in modules/promotion/src/Plugin/Commerce/PromotionOffer/OrderItemFixedAmountOff.php

Provides the percentage off offer for order items.

OrderItemPercentageOff in modules/promotion/src/Plugin/Commerce/PromotionOffer/OrderItemPercentageOff.php

Provides the percentage off offer for order items.

OrderPercentageOff in modules/promotion/src/Plugin/Commerce/PromotionOffer/OrderPercentageOff.php

Provides the percentage off offer for orders.