Is possible to put plugin into a PHP (without widgets) sidebar?

I’ve found this <?php echo do_shortcode( ‘[optin-cat id=1361]’ ); ?> but….which is my sidebar ID?

I think that code should work, the ID does not refer to the sidebar but to which Optin Cat form you’d like displayed there.

You can find the ID in the URL of the post in the Optin Cat editor:
https://imgur.com/87Ds8Bx

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