I would also like to do this, except to get authorization. The upgrade docs here: https://developer.paypal.com/docs/checkout/reference/upgrade-integration/ clearly indicate that NVP/SOAP with reference transactions are supported. However, when attempting to actually use the code as shown, and with a Express Checkout token, the button is throwing an error. If it creates an order (not what I want), then it works, but token, nope. What's the missing magic that makes this document work?
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