pmpro_after_require_membership_metabox

Use this hook to add additional content or settings inside the “Require Membership” metabox on the single post or page edit screen.

do_action( 'pmpro_after_require_membership_metabox', $post );

Source

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/includes/metaboxes.php

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