getUserOpenId(callback)是系统函数还是用户自定义函数？怎么用？
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- Callback Back Sample: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Event callback access process: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/Event callback access process
- Callback request parameter example: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback request parameter explaination: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback return parameter specification: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
自定义的