Spreedly Paypal gateway_specific_fields to return zipCode

Hallo,

I'm currently making the below spreedly:paypal call to authorize a card.

uri=https: //core.spreedly.com/v1/gateways/***************/authorize.json
body={
  transaction: {
    payment_method_token: '*********************',
    amount: 1,
    currency_code: 'EUR',
    retain_on_success: true,
    redirect_url: '*******',
    callback_url: '*******'
  }
}

In the response I'm looking for buyer information(zipCode, country, etc) as mentioned in the doc here: https://docs.spreedly.com/payment-gateways/paypal/#buyer-information

But my gateway_specific_response_fields are empty.

    gateway_specific_fields: null,
    gateway_specific_response_fields: {
      
    },

How do I make sure that my authorize call includes buyer information as well. I scoured through the API doc, but I couldn't find any relevant detail.

Can you help me on how to get the buyer information in the response?

Thanks & Appreciate.