Hi,
 
I am trying to add the cardholder info to the transaction.
basically I want to add the 
['creditCard']['cardholderName']
parameter.
During my tests I have found where the transaction is done (vendor/magento/module-braintree/Model/Adapter/BraintreeAdapter.php:145), and adding this line just before the 
Transaction::sale
call, works:
 
$attributes['creditCard']['cardholderName'] = "name here";
The problem is that the PaymentDataBuilder only manages merchant_id, amount, payment_method_nonce and order_id.
 
I cannot use a plugin, I think, because the $subjectReader object is private.
 
I have had a look at the official documentation about Payments Integrations, but here I need to extend something, I don't want to rewrite the builder.
 
Do you have any hints about it?
 
Thanks!
 
Lorenzo