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src/pages/buy/components/BuyPopup.vue

@@ -132,7 +132,7 @@ export default {
         spu_id: this.spu_id,
         sku_id: this.spec,
         buy_count: this.form.count,
-        payment_method: '3',
+        payment_method: '4',
         app_button_text: JSON.stringify(fields)
       }
       this.$emit('placeOrder', params)