Using EDD 2.5 Setting Tab Subsections

edd-subsections-example.php

<?php

/**
* Register our settings section
*
* @return array
*/
function ck_edd_settings_section( $sections ) {
	// Note the array key here of 'ck-settings'
	$sections['ck-settings'] = __( 'Example EDD Extension', 'example-edd-extension' );

	return $sections;
}
add_filter( 'edd_settings_sections_extensions', 'ck_edd_settings_section' );

/**
* Register our settings
*
* @return array
*/
function ck_edd_settings( $settings ) {

	// Your settings reamain registered as they were in EDD Pre-2.5
	$my_settings = array(
		array(
			'id'   => 'my_header',
			'name' => '<strong>' . __( 'My Example', 'edd_sl' ) . '</strong>',
			'desc' => '',
			'type' => 'header',
			'size' => 'regular'
		),
		array(
			'id'    => 'my_example_setting',
			'name'  => __( 'Example checkbox', 'example-edd-extensions' ),
			'desc'  => __( 'Check this to turn on a setting', 'example-edd-extensions' ),
			'type'  => 'checkbox'
		),
		array(
			'id'    => 'my_example_text',
			'name'  => __( 'Example text', 'example-edd-extensions' ),
			'desc'  => __( 'A Text setting', 'example-edd-extensions' ),
			'type'  => 'text',
			'std'   => __( 'Example default text', 'example-edd-extensions' )
		),
	);

	// If EDD is at version 2.5 or later...
	if ( version_compare( EDD_VERSION, 2.5, '>=' ) ) {
		// Use the previously noted array key as an array key again and next your settings
		$my_settings = array( 'ck-settings' => $my_settings );
	}

	return array_merge( $settings, $my_settings );
}
add_filter( 'edd_settings_extensions', 'ck_edd_settings' );