diff --git a/ozon/common.go b/ozon/common.go
index ea17a4b..4dbdb30 100644
--- a/ozon/common.go
+++ b/ozon/common.go
@@ -698,3 +698,109 @@ const (
 
 	GetCarriageStatusCancelled GetCarriageStatus = "cancelled"
 )
+
+type TransactionOperationService string
+
+const (
+	// return of unclaimed products from the customer to the warehouse
+	TransactionNotDelivered TransactionOperationService = "MarketplaceNotDeliveredCostItem"
+
+	// return from the customer to the warehouse after delivery
+	TransactionReturnAfterDelivery TransactionOperationService = "TransactionOperationServiceNotDelivered"
+
+	// product delivery to the customer
+	TransactionDelivery TransactionOperationService = "MarketplaceDeliveryCostItem"
+
+	// purchasing reviews on the platform
+	TransactionSaleReviews TransactionOperationService = "MarketplaceSaleReviewsItem"
+
+	// products delivery to the Ozon warehouse (cross docking)
+	TransactionItemAdForSupplierLogistic TransactionOperationService = "ItemAdvertisementForSupplierLogistic"
+
+	// product placement service
+	TransactionServiceStorageItem TransactionOperationService = "MarketplaceServiceStorageItem"
+
+	// products promotion
+	TransactionMarketingActionCost TransactionOperationService = "MarketplaceMarketingActionCostItem"
+
+	// promotion and selling on an instalment plan
+	TransactionServiceItemInstallment TransactionOperationService = "MarketplaceServiceItemInstallment"
+
+	// mandatory products labeling
+	TransactionServiceMarkingItems TransactionOperationService = "MarketplaceServiceItemMarkingItems"
+
+	// flexible payment schedule
+	TransactionServiceFlexiblePaymentSchedule TransactionOperationService = "MarketplaceServiceItemFlexiblePaymentSchedule"
+
+	// picking up products for removal by the seller
+	TransactionServiceReturnFromStock TransactionOperationService = "MarketplaceServiceItemReturnFromStock"
+
+	// forwarding trade
+	TransactionItemAdForSupplierLogisticSeller TransactionOperationService = "ItemAdvertisementForSupplierLogisticSeller"
+
+	// last mile
+	TransactionServiceDeliveryToCustomer TransactionOperationService = "MarketplaceServiceItemDelivToCustomer"
+
+	// pipeline
+	TransactionServiceDirectFlowTrans TransactionOperationService = "MarketplaceServiceItemDirectFlowTrans"
+
+	// shipment processing
+	TransactionServiceDropoffFF TransactionOperationService = "MarketplaceServiceItemDropoffFF"
+
+	// shipment processing
+	TransactionServiceDropoffPVZ TransactionOperationService = "MarketplaceServiceItemDropoffPVZ"
+
+	// shipment processing
+	TransactionServiceDropoffSC TransactionOperationService = "MarketplaceServiceItemDropoffSC"
+
+	// order packaging
+	TransactionServiceFulfillment TransactionOperationService = "MarketplaceServiceItemFulfillment"
+
+	// picking products up by car from the seller's address (Pick-up)
+	TransactionServicePickup TransactionOperationService = "MarketplaceServiceItemPickup"
+
+	// return processing
+	TransactionServiceReturnAfterDelivToCustomer TransactionOperationService = "MarketplaceServiceItemReturnAfterDelivToCustomer"
+
+	// reverse pipeline
+	TransactionServiceReturnFlowTrans TransactionOperationService = "MarketplaceServiceItemReturnFlowTrans"
+
+	// cancellation processing
+	TransactionServiceReturnNotDelivToCustomer TransactionOperationService = "MarketplaceServiceItemReturnNotDelivToCustomer"
+
+	// unredeemed order processing
+	TransactionServiceReturnPartGoodsCustomer TransactionOperationService = "MarketplaceServiceItemReturnPartGoodsCustomer"
+
+	// acquiring payment
+	TransactionRedistributionOfAcquiringOperation TransactionOperationService = "MarketplaceRedistributionOfAcquiringOperation"
+
+	// FBS return short-term placement
+	TransactionServiceAtPickupPointFBS TransactionOperationService = "MarketplaceReturnStorageServiceAtThePickupPointFbsItem"
+
+	// FBS return long-term placement
+	TransactionServiceInWarehouseFBS TransactionOperationService = "MarketplaceReturnStorageServiceInTheWarehouseFbsItem"
+
+	// bulky products delivery
+	TransactionServiceDeliveryKGT TransactionOperationService = "MarketplaceServiceItemDeliveryKGT"
+
+	// logistics
+	TransactionServiceDirectFlowLogistic TransactionOperationService = "MarketplaceServiceItemDirectFlowLogistic"
+
+	// reverse logistics
+	TransactionServiceReturnFlowLogistic TransactionOperationService = "MarketplaceServiceItemReturnFlowLogistic"
+
+	// "Seller's Bonus" promotion service
+	TransactionServicePremiumCashbackIndPoints TransactionOperationService = "MarketplaceServicePremiumCashbackIndividualPoints"
+
+	// Premium promotion service, fixed commission
+	TransactionServicePremiumPromotion TransactionOperationService = "MarketplaceServicePremiumPromotion"
+
+	// withholding for product shortage
+	TransactionServiceWithHoldingForUndeliverableGoods TransactionOperationService = "OperationMarketplaceWithHoldingForUndeliverableGoods"
+
+	// drop-off service at the pick-up point
+	TransactionServiceDropoffPPZ TransactionOperationService = "MarketplaceServiceItemDropoffPPZ"
+
+	// reissue of returns at the pick-up point
+	TransactionServiceRedistributionReturnsPVZ TransactionOperationService = "MarketplaceServiceItemRedistributionReturnsPVZ"
+)
diff --git a/ozon/finance.go b/ozon/finance.go
index d5039e1..ae94c54 100644
--- a/ozon/finance.go
+++ b/ozon/finance.go
@@ -382,7 +382,7 @@ type ListTransactionsResultOperationPosting struct {
 
 type ListTransactionsResultOperationService struct {
 	// Service name
-	Name string `json:"name"`
+	Name TransactionOperationService `json:"name"`
 
 	// Price
 	Price float64 `json:"price"`
diff --git a/ozon/products.go b/ozon/products.go
index 6279cdc..b78a09e 100644
--- a/ozon/products.go
+++ b/ozon/products.go
@@ -890,6 +890,7 @@ type CreateOrUpdateProductResult struct {
 }
 
 // This method allows you to create products and update their details
+// More info: https://docs.ozon.ru/api/seller/en/#operation/ProductAPI_ImportProductsV3
 func (c Products) CreateOrUpdateProduct(ctx context.Context, params *CreateOrUpdateProductParams) (*CreateOrUpdateProductResponse, error) {
 	url := "/v3/product/import"
 
diff --git a/ozon/strategies.go b/ozon/strategies.go
index 23c871a..2e64a25 100644
--- a/ozon/strategies.go
+++ b/ozon/strategies.go
@@ -377,6 +377,7 @@ type GetCompetitorPriceResult struct {
 	StrategyCompetitorProductURL string `json:"strategy_competitor_product_url"`
 }
 
+// If you add a product to your pricing strategy, the method returns you the price and a link to the competitor's product
 func (c Strategies) GetCompetitorPrice(ctx context.Context, params *GetCompetitorPriceParams) (*GetCompetitorPriceResponse, error) {
 	url := "/v1/pricing-strategy/product/info"