Register the settings for our settings page.

class-toptal-save-admin.php

/**
 * Register the settings for our settings page.
 *
 * @since    1.0.0
 */
public function register_settings() {

	// Here we are going to register our setting.
	register_setting(
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings',
		array( $this, 'sandbox_register_setting' )
	);

	// Here we are going to add a section for our setting.
	add_settings_section(
		$this->plugin_name . '-settings-section',
		__( 'Settings', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_section' ),
		$this->plugin_name . '-settings'
	);

	// Here we are going to add fields to our section.
	add_settings_field(
		'post-types',
		__( 'Post Types', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_multiple_checkbox' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'post-types',
			'description' => __( 'Save button will be added only to the checked post types.', 'toptal-save' )
		)
	);
	add_settings_field(
		'toggle-content-override',
		__( 'Append Button', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_single_checkbox' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'toggle-content-override',
			'description' => __( 'If checked, it will append save button to the content.', 'toptal-save' )
		)
	);
	add_settings_field(
		'toggle-status-override',
		__( 'Membership', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_single_checkbox' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'toggle-status-override',
			'description' => __( 'If checked, this feature will be available only to logged in users. ', 'toptal-save' )
		)
	);
	add_settings_field(
		'toggle-css-override',
		__( 'Our Styles', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_single_checkbox' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'toggle-css-override',
			'description' => __( 'If checked, our style will be used.', 'toptal-save' )
		)
	);
	add_settings_field(
		'text-save',
		__( 'Save Item', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_input_text' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'text-save',
			'default'   => __( 'Save Item', 'toptal-save' )
		)
	);
	add_settings_field(
		'text-unsave',
		__( 'Unsave Item', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_input_text' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'text-unsave',
			'default'   => __( 'Unsave Item', 'toptal-save' )
		)
	);
	add_settings_field(
		'text-saved',
		__( 'Saved. See saved items.', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_input_text' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'text-saved',
			'default'   => __( 'Saved. See saved items.', 'toptal-save' )
		)
	);
	add_settings_field(
		'text-no-saved',
		__( 'You don\'t have any saved items.', 'toptal-save' ),
		array( $this, 'sandbox_add_settings_field_input_text' ),
		$this->plugin_name . '-settings',
		$this->plugin_name . '-settings-section',
		array(
			'label_for' => 'text-no-saved',
			'default'   => __( 'You don\'t have any saved items.', 'toptal-save' )
		)
	);

}