Adding a custom form in the custom post editor

Hi!

Im currently trying to find a way to add a custom form in the backend editor for each custom post (“places”, gd_place). I need these values to be retrieved later for a pdf document. So far I’ve tried this:

1) I was trying with ACF until I realized both plugins are not compatible with each other because they manage their db differently. So I ditched ACF.

2) Im aware of the Listing Form in the Places plugin’s settings. I made the form using these options, and now I’m in need of retrieving these values through php. I looked through the documentation, and while I found a lot of information on the option the plugin provides, I couldn’t find how.

The idea would be to do something like this:
$value = get_value(‘field_key’, $post_id);

3) Is there a way to add a form directly into the gd_place backend editor with php?



I’ll appreciate any help you could provide. Thanks in advance.