Has anyone posted to several VK groups at once?

Question

In contact with

Doing in a loop

curl https ://api.vk.com/method/wall.post
блаблабла

There is a picture and text, no links.
Sometimes successfully, sometimes fifty-fifty - that is. in some groups it was posted, in some groups it was not.
I also tried multi-curl - a similar result.
What else do they need??

Answer 1

And what error does the server return when the post is not created?

Answer 2

they need to not be spammed. Therefore, simply by the frequency of attempts to create a post with the same content, it can start requesting a captcha, for example.
The exact reason is in the server response, in the content of the error field.