# Customer Receipt Notice

After the user initiates the coupon operation on WeChat, the user will call back the merchant to receive the coupon, and the merchant will return the specific coupon result according to the stock of the coupon. If the merchant returns successfully, the platform side will record the returned user coupons, in order to avoid the failure of recording due to network anomalies, etc. It is recommended that merchants call "Add User Coupon" interface when issuing coupons successfully. The platform side will ensure the uniqueness according to the merchant side coupon ID and merchant side user voucher ID returned by merchants.It is recommended to also call the Update Coupon Inventory interface for inventory updates.

# Callback request parameter example

Depending on the data format (json or xml) set by the merchant, xml is an example

<xml>
    <ToUserName>gh_abcdefg</ToUserName> 
    <FromUserName>oABCD</FromUserName> 
    <CreateTime>12344555555</CreateTime>
    <MsgType>event</MsgType> 
    <Event>open_product_receive_coupon</Event>
    <out_coupon_id>real_out_coupon_id</out_coupon_id>
    <request_id>real_request_id</request_id>
</xml>

# Callback Back Sample

Depending on the data format (json or xml) set by the merchant, xml is an example

<xml> 
  <out_user_coupon_id>real_out_user_coupon_id</out_user_coupon_id>  
  <request_id>real_request_id</request_id>  
  <right_code>0</right_code>
  <right_msg>ok</right_msg>
  <out_coupon_id>real_out_coupon_id</out_coupon_id> 
</xml>

# Callback request parameter explaination

# Callback return parameter specification