When you buy an account you will receive an email with the following details:
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Account username and password
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Email account username and password
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Cookies to auto login in accounts
You can use Cookie-Editor extension available for all browsers.
After you install the extension visit Gmail or Google Ads websites or the domains you bought the account, click on the Extension, click the Delete icon for all values and then click Import. In the Import window paste the cookies received in the .txt document.