Add support for dynamic quota
to aggregating quota limit from different product SKUs.
for example, if user plans to budget 150,000 calls per month he can buy SKU1 with 100,000 and SKU2 with 50,000 calls and the aggregate is calculated for this subscriber and enforced by APIM. this way we just create a few SKUs and allow users to mix and match based on their requirements.
Under current model SKU1 and SKU2 would be 2 different products with two separate subscriptions and keys. So this is not a trivial change but we understand the scenario and will keep it in mind.