The refunds/create webhook doesn’t include customer information in its payload. You can see an example of the expected response in our webhook documentation here: Webhooks
If you need customer information with refunds, consider testing if the orders/updated webhook will work instead, which does include customer data.
we can see Refund ->order->customer.
I solved this problem by calling grapql using order_id to get cutomer info and shipping address .This may not be right but i didn’t get any other solution