I experienced the same thing today. But i think what you are looking for is API credentials for a developer account. Try login to the dashboard at developer.paypal.com with your new paypal account, navigate to Sandbox - Accounts. There shoud be a buyer and facilitator account, if not create those as personal and business account. Click on the business account and click on Profile - there is a tap API with the login credetiols - obvious! 😉 I hope that helps.
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