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Premium subscriptions will be charged on daily basis. The channel creator is free to upgrade or downgrade any day as per their requirement. Once in a paid plan the subscriber cannot downgrade to a free plan. If the balance is exhausted the subscriber will be automatically downgraded to free plan.
The Billing page will have details of the current plan, subscriber balance, estimated balance exhaustion date and balance notifications remaining in the plan.
You can add fund to your balance which will be consumed on daily basis depending on the plan you have chosen. Addition of fund has to be done in USDC (Algorand).