I think I've burned through that $20 very quickly on the pay-as-you-go but it won't actually tell me the cost until September! Something to watch out for if, like me you never used this system before. Should probably use the Token Plan.
Actually if I look at the coupon, I can see that it is being used. So perhaps that is why I'm not seeing the usage on the billing page. Looking at the documentation on alibaba cloud, I think we cannot use it for for Token Plan. It's all a bit confusing.