If a customer wants to top-up their Azure account, they can purchase additional OSA Keys at any time from their reseller. A customer can also purchase more Azure credit with a credit card. However, credit card purchases are only recommended in a situation where a customer needs to top-up
quickly and cannot reach their reseller, such as a holiday weekend. As a reseller, it is recommended that you manage customer usage to prevent such a scenario from occurring. That way, customers can continue to purchase the SKUs/tokens from their reseller, and you can continue to earn margin and provide consulting services.