微信群发，群发图文消息后又一定几率收不到callback？具体的原因有哪些呢？
发了三条图文，其中两条收到了callback，有一条没有收到callback
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- Callback Back Sample: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Event callback access process: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/Event callback access process
- Callback request parameter example: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback request parameter explaination: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback return parameter specification: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback