1

Here is my app's code:

app's code

However, I get this error:

pop-up with the error "applications must have a registered Stack Apps post to write"

2

From the documentation:

Apps must have a registered Stack Apps post to write.

The next sentence (about links pointing back) is no longer true, but the one after that is right and important too:

You can add or change your app's registered post from the Stack Apps App Management page.

Since this question is tagged , you can use this one as the registered post, even though officially you should use another one. For testing purposes, it's fine I guess.

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