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In the Agency Panel, you can view all client accounts there, adjust their billing via the Buy Online Place an order feature, etc.
1) Set User Permissions: if you want to give access to your client to the account, you must purchase additional administrators. Then, Create Users and Assign User Permissions. Here, you can decide what the client has and does not have access to in the account.
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Note, to "nickname" the account to show your client's name, follow the directions instructions in the View Accounts.