I am using PayPal checkout via Braintree and also support credit card payment through PayPal with `fundingSource` set to `paypal.FUNDING.CARD`. The customer already gave me it's address during the checkout address. Some are confused that they have to enter a billing address again inside the PayPal checkout page.
Is there a possibility to at least prefill the billing address data on the PayPal checkout page, or probably even make it uneditable? I tried adding the `payer` object to the `createPayment` methods parameters, but that didn't work ^^