How to import and export settings from live customizer?

I recently built this for one of my themes…
Export: https://github.com/wpmu/maera/blob/7492f7b90544c792a3eb752d8552674882e1c1cd/lib/admin-page.php#L105-L117
Import: https://github.com/wpmu/maera/blob/7492f7b90544c792a3eb752d8552674882e1c1cd/lib/admin-page.php#L124

That file actually contains an entire admin page with the export data and import textarea so you could simply get that and modify it to suit your own needs.

I hope that helps!

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