Good day @mycause,
Thank you for posting to the PayPal community.
Adaptive Payments is not available for new integrations. PayPal provides this documentation to support existing integrations.
https://developer.paypal.com/docs/archive/adaptive-payments/
Please cross check your PayPal Business account and make sure it is verified and confirmed without any account limitations.
Try to process a test payment via card which is not linked to your PayPal account. Since, merchant can't process self payments.
If your still facing any issues, please create a MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detail information and error details.
Unfortunately, we no longer onboard Adaptive applications as the product has been deprecated.
PayPal Commerce Platform for Marketplaces and Platforms product is a replacement of Adaptive payments, which serves the similar product experience.
For LIVE integration, please fill the MarketPlace application via below link.
https://www.paypal.com/us/webapps/mpp/partner-program/contact-us?ref=marketplace
https://developer.paypal.com/docs/multiparty/get-started/#link-stepgolive
Once applied, respective team will be reviewing your business details and contact you directly.
Guide link - https://developer.paypal.com/docs/multiparty/
Sincerely,
Chiranjeevi
PayPal/Braintree MTS
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