Connecting a package without a namespace, how?

Question

PHP

How to include a package in a project that doesn't have a namespace, more precisely how to make it usable for a laravel project.
serj1chen/way-for-pay-sdk-php - this package is interesting.
connected it via composer.json

"type": "package",
            "package": {
                "name": "serj1chen/way-for-pay-sdk-php",
                "version": "dev-master",
                "source": {
                    "url": "https://github.com/serj1chen/way-for-pay-sdk-php.git",
                    "type": "git",
                    "reference": "origin/master"
                }
            }

but how to use it correctly in the project is not very clear, I will be very grateful for the answers

Answer 1

You need to set the path to the class

"autoload": {
        "classmap": [
            "vendor/serj1chen/way-for-pay-sdk-php/WayForPay.php"
        ]
    },

Answer 2

Make fork and rewrite under namespace`s.

Answer 3

In the package section, add autoload files.

"autoload": {
  "files": [
     ...
  ]
}