In the Azure portal I have added two different credit cards. One of them is set as Default.
I have several pay-as-you-go subscriptions. All of them show the "Default payment method" and I can't find any way to specify the payment method per subscription. Should this be possible?
I tried to reproduce the same in my environment to Set different payment method for Azure pay-as-you-go subscriptions:
Please follow the steps to change the payment method.
Azure Portal > Subscription > Payment Methods > Add payment method.
If you have 2 or more payment methods in single subscription, to make it as default payment method, Select make default option.
Reference: Add, update, or delete a payment method - Microsoft Cost Management