fix wechat virtual payment coin flow

miniprogram/pages/wechat-pay/index.shared.js

@@ -105,6 +105,10 @@ function requestOrdinaryPayment(payParams) {
 function requestVirtualPayment(payParams) {
   return new Promise((resolve) => {
     if (!canUseVirtualPayment() || typeof wx.requestVirtualPayment !== 'function') {
+      console.error('[wechat-pay] requestVirtualPayment unavailable', {
+        canUseVirtualPayment: canUseVirtualPayment(),
+        hasRequestVirtualPayment: typeof wx.requestVirtualPayment === 'function',
+      });
       resolve({
         status: 'fail',
         errorMessage: '当前微信基础库不支持 requestVirtualPayment',
@@ -120,6 +124,7 @@ function requestVirtualPayment(payParams) {
         resolve({ status: 'success', errorMessage: '' });
       },
       fail(error) {
+        console.error('[wechat-pay] requestVirtualPayment failed', error);
         resolve({
           status: resolvePayStatus(error),
           errorMessage: normalizePayError(error),