Log in to your Seller Assistant account and go to the subscriptions page, where you can see your current subscription plan.

To upgrade your subscription plan, click the “Manage Subscription” button.
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After clicking the “Manage Subscription” button, you will see the subscription management page. Click “Update plan”.

Select the desired plan and click "Continue".

Wait for the plan to upgrade. In meantime, the payment system will automatically recalculate the tariff and withdraw the payment from the linked payment card.

If the payment is successful, in your personal account you will see a new subscription plan.