Error analysis: the preview rights failed, incorrect parameters when calling for payment, missing package in the MWEBURL.

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Under the H5 payment service provider mode, uploading the request parameters for unified order placement scene-info is optional both under the service provider mode and the general merchant mode.

Error Analysis: system error. Solution: System error, please re-call using the same parameters.

The configured domain should be top-level domain, for example, if the payment page is xxx.xx.qq.com or xx.qq.com/xx, use qq.com as the configuration.

Please check against the following methods:

1. Confirm the payment status when initiating "check the order interface".

2. Lower the frequency and try again.

No, embedding H5 in the app is not supported.

After the H5 page is initiated for payment as per the H5_url, it is bound to redirect to the page with configured redirect-url no matter whether it is successful or not.

1. Carry out urlencode process for the redirect_url.

2. It is because after the redirect_url is configured, the operation that switches the page to a specified page may occur in the following two situations:

2.1. It has been more than five seconds since WeChat Cashier was initiated by the intermediate WeChat Pay page.
2.2. The user pressed "Cancel the payment", or "Complete" button after completing the payment, so there is a chance that the payment process was not yet complete when the page switched. Therefore, the redirect_url configured by the merchant cannot check the orders. The user should press the button to trigger the order checking.

Currently, payment via H5 can only direct back to the browser, and cannot direct back to the app. If you need to pay within the app, please use payment via app.

Confirmation can be made through the following methods:

1. If payment is successful, a payment notification will be received on WeChat Pay, please accept and process the updated order status properly.

2. Initiate order checking after payment.

**H5 Payment**:
H5 payment refers to when the merchant displays products or services on the mobile web page outside the WeChat client, the user confirms to use WeChat Pay on the aforementioned page, and the merchant initiates this service to call up the WeChat client for payment.
It is mainly used in scenarios where touchscreen mobile browsers request WeChat payment.
WeChat Pay can be conveniently called up by external browsers.
**Payment through Mini Program** :
The merchant has a Mini Program.
When the user opens the Mini Program via sharing by a friend or scanning QR codes, WeChat Pay can be called up to complete the purchase process.

When non-WeChat browser calls H5 payment, the official account ID (APPID) and merchant ID are needed for the unified order placement interface

The parameter "spbill_create_ip" in the unified order placement interface refers to the user's client IP (the client IP that evokes WeChat Pay), which supports IP addresses in both IPV4 and IPV6 formats

In spbill_create_ip field, there is no priority if ipv4 and ipv6 coexist. Either is OK.

Error analysis: The preview failed because the parameter goes wrong when the payment is called. Package is missing in MWEBURLl