Example: Set posts for sale by default

add_action( 'transition_post_status', 'mycredpro_all_content_for_sale', 99, 3 );
function mycredpro_all_content_for_sale( $new_status, $old_status, $post ) {

	// Make sure this is only applied to "Posts" and no other point type
	if ( ! isset( $post->post_type ) || $post->post_type != 'post' ) return;

	// Make sure the post is transitioning from not being published to being published e.g. Draft > Publish
	if ( $new_status !== 'publish' || $old_status === 'publish' ) return;

	// Get price
	$price = get_post_meta( $post->ID, 'ndna-price', true);

	// Set post for sale
	$setup = array(
		'status'       => 'enabled', // enabled - for sale, disabled - not for sale
		'price'        => $price, // price in points
		'button_label' => 'Get access to this lead', // the purchase button label
		'expire'       => 0 // Option to expire sale after x number of days
	);

	// Save to enable
	update_post_meta( $post->ID, 'myCRED_sell_content', $setup );

}