command.cs

public class ChangeCustomerPricingLevel : IAsyncRequest
{
    public Guid CustomerId { get; }
    public PricingLevel PricingLevel { get; }

    public ChangeCustomerPricingLevel(Guid customerId, PricingLevel pricingLevel)
    {
        CustomerId = customerId;
        PricingLevel = pricingLevel;
    }
}