Hello, I am from the zuora engineer team. Currently Zuora is using the NVP API which is deprecated with Braintree REST API. so for the BAID, in our KC, it is based on the NVP API to create the BAID before calling create payment method in zuora. It may use the REST API to create the BAID, but we did not verify it yet. from our side, recommend you to keep to use the NVP API instead of the REST API to create the BAID even though it is deprecated. we will add new Paypal API integration into our development Pipleline. Please let me know if i answer all of your questions.
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