diff --git a/pages-activity/activity/yifanshang/index.vue b/pages-activity/activity/yifanshang/index.vue
index 4beb7f7..34a504d 100644
--- a/pages-activity/activity/yifanshang/index.vue
+++ b/pages-activity/activity/yifanshang/index.vue
@@ -380,7 +380,9 @@ async function onPaymentConfirm(paymentData) {
     const joinData = {
       activity_id: Number(activityId.value),
       issue_id: Number(currentIssueId.value),
-      choices: selectedChoices.value.map(c => Number(c.id || c.number)),
+      channel: 'miniapp',
+      count: selectedChoices.value.length,
+      slot_index: selectedChoices.value.map(c => Number(c.id || c.number)),
       coupon_id: paymentData.coupon_id || 0,
       item_card_id: paymentData.item_card_id || 0,
       use_game_pass: paymentData.use_game_pass || false