Good day,
Thank you for posting to the PayPal community.
Please cross check your PayPal Business account and make sure it is verified and confirmed without any account limitations.
Merchants can manually grant permission to a third-party eCommerce to access specific information in your PayPal account and perform PayPal API operations on your behalf.
Login PayPal.com >> Settings >> Account Settings >> Website payments >> API Access >> Pre-built payment solution >> Grant API permission >> contact your "Third party software eCommerce" for Third Party Permission Username >> enter the username.
Direct link - https://www.paypal.com/cgi-bin/webscr?cmd=_profile-api-grant-authorization
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/admin/third-party/
If your still facing issues, please create an MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detailed information and error details.
Sincerely,
Kavya
PayPal MTS
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