service

type CreateCustomerRequest struct {
	Name   string
	Amount decimal.Decimal
}

type ReserveCreditRequest struct {
	OrderID    uuid.UUID
	CustomerID uuid.UUID
	Amount     decimal.Decimal
}

type Service interface {
	CreateCustomer(ctx context.Context, req CreateCustomerRequest) (uuid.UUID, error)
	ReserveCredit(ctx context.Context, req ReserveCreditRequest) error
}