如何自定义PayPal评论页面订单详细信息

I integrated PayPal Express Checkout in an auction website and to calculate the total amount of a product I have different custom parameters like auction_fee. I mapped auction_fee on PAYMENTREQUEST_0_TAXAMT in my setExpressCheckout method like below

if (isset($ec_data['tax_amount'])) {
            $tax_amount = (float)$ec_data['tax_amount'];
            $nvpstr.= "&PAYMENTREQUEST_0_TAXAMT=" . urlencode(sprintf('%.2f', $tax_amount));
        }

This gives me view like this in PayPal enter image description here

But our end users mistakenly consider Tax an extra charge and we want to rename it to Auction Fee. Like this below enter image description here I have gone through these links but no joys

stack1 stack2 PayPal1 PayPal2

Please suggest some solution for this.

Thanks in advance.

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