This article explains how to use APIs to create sub-account from a Master account available to partners.
After you create the sub-account you can login and create as many apps as needed in each sub-account.
You will need to:
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1 is open the Partner tab
2 is fill in the name and email on the account (email must be unique and live and active as it will be used to reset a password just in case)
3 is click Create button
It can take up to 1 minute so please be patient, you will get all login credentials for the new account:
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To view all your sub accounts please visit this article.