protected function enrollment_exists( $student_id, $post_id, $trigger = 'any', $wp_error = true ) {

		$student = llms_get_student( $student_id );

		if ( empty( $student ) ) {
			return $wp_error ? llms_rest_not_found_error() : false;
		}

		$current_status = $student->get_enrollment_status( $post_id );

		if ( empty( $current_status ) ) {
			return $wp_error ? llms_rest_not_found_error() : false;
		}

		if ( 'any' !== $trigger && $trigger !== $student->get_enrollment_trigger( $post_id ) ) {
			return $wp_error ? llms_rest_not_found_error() : false;
		}

		return true;

	}