Store Run on Mobile Applications
Merchants who have App or WeChat mini programs can refer to this part to integrate WeChat Pay.
Scenario Description
If a merchant runs its store on a released app, the In-App Payment (What is In-APP payment) provided by WeChat Pay can be used. The user experience flow map is shown below:
After a user initiates a payment request, the merchant sends the request to the institution, and the institution then requests WeChat Pay to obtain the pre-payment ID and returns the ID merchant. Finally, the merchant uses the WeChat SDK to redirect the user to WeChat to complete the payment. After completing the payment, the user will be automatically redirected from WeChat to the merchant's app.
Parameter Configuration
In this scenario, besides the basic parameter settings, including Parameters needs to be applied, API key configuration and Certificate configuration, the following configurations are also required:
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1Register App
In-App Payment requires a sub-merchant to register an app on WeChat Open Platform. Note that the entity for registration must be consistent with that of the sub-merchant ID generated by the institution.
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2Obtain sub_appid
Once the app is registered and the entity is successfully authenticated, the sub-merchant can view the corresponding appid on the open platform, as shown below:
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3Link sub_appid with sub_mch_id
After the sub-merchant obtains the appid, it needs to sync the appid with the institution. The institution will then link the sub_appid with sub_mch_id on the sub-merchants management page.
Precautions
Parameter transfer rules for In-App Payment are slightly different from those of other payment modes. Refer to API Rules for details.
