Reply To: Is it possible to create a Metabox Group type metabox through API?

Hello,

It's relatively simple. You just need to:

• Send a POST request to the endpoint to update a post .
• In the array of parameter sent to the server, add a field meta_box to store all custom fields' values, including groups.
• Put array of group's value into the meta_box field. Remember to format the group value properly, e.g. an array of sub-field's value. In short, send the data in the format when you click the Publish button in the frontend.

Then the plugin will handle the rest and update the post with correct value.