2. For SDK, there is no demonstration.
3. There is no related documentation of SDK.
4. For the description of SDK, the description on the website is completely inconsistent with the description in the source code.
5. Since SDK does not encapsulate those common accesses, users need to call SDK in combination to assemble them. In short, this is too abstract. Look at the API of seven cows. Hey, not much to say.
6. The provided SDK path is confusing, so there is no way to use it directly, and various adjustments should be made.
7. The registered version of SDK based on PHP is high, which can't take care of some lower users.