public function get_free_enroll_form_fields( $plan ) {

		// Convert all fields to hidden fields and remove any fields hidden by LLMS block-level visibility settings.
		add_filter( 'llms_forms_block_to_field_settings', array( $this, 'prepare_field_for_free_enroll_form' ), 999, 3 );
		$fields = $this->get_form_fields( 'checkout', compact( 'plan' ) );
		remove_filter( 'llms_forms_block_to_field_settings', array( $this, 'prepare_field_for_free_enroll_form' ), 999, 3 );

		// If no fields are found, ensure we add to an array instead of casting false to an array (causing a PHP 8.1 deprecation warning).
		$fields = ! is_array( $fields ) ? array() : $fields;

		// Add additional fields required for form processing.
		$fields[] = array(
			'name'           => 'free_checkout_redirect',
			'type'           => 'hidden',
			'value'          => $plan->get_redirection_url( false ),
			'data_store_key' => false,
		);

		$fields[] = array(
			'id'             => 'llms-plan-id',
			'name'           => 'llms_plan_id',
			'type'           => 'hidden',
			'value'          => $plan->get( 'id' ),
			'data_store_key' => false,
		);

		/**
		 * Filter the list of LLMS_Form_Fields used to generate the "free enrollment" form
		 *
		 * @since 5.0.0
		 *
		 * @param array[]          $fields List of LLMS_Form_Field settings arrays.
		 * @param LLMS_Access_Plan $plan   Access plan being used for enrollment.
		 */
		return apply_filters( 'llms_forms_get_free_enroll_form_fields', $fields, $plan );

	}