The samples are all completely independent and self-contained.

Under Readme section "Using the Sample Code" - https://github.com/CyberSource/cybersource-rest-samples-php#using-the-sample-code - it states "The samples are all completely independent and self-contained.", but after reviewing the code, this doesn't appear to be true.

Example:
https://github.com/CyberSource/cybersource-rest-samples-php/blob/master/Samples/Payments/Payments/AuthorizationWithCaptureSale.php

This file has code:

require_once __DIR__ . DIRECTORY_SEPARATOR . '../../../Resources/ExternalConfiguration.php';

which is another file in the repo. Maybe I'm reading the blurb wrong, but that file to me is a sample, and if it's self-contained it shouldn't require other files.

Anyway, even if I consider "self-contained" samples to mean "the repo is self-contained as a run app", then that's not exactly true either. The above line of code requires vendor through composer that's compatible with PHP 5.6:

require_once __DIR__ . DIRECTORY_SEPARATOR . '../../../vendor/autoload.php';

This is required for at least one line in that AuthorizationWithCaptureSale.php sample file's code, like:

$api_instance = new CyberSource\Api\PaymentsApi($api_client);

I'm working on a Mac (Ventura) that doesn't have PHP 5.6 or a compatible version of composer installed, so I will have to do a deep-dive to figure that out for a "self-contained" sample file.

Anyway, I can try to get the whole repo with vendor code running, but to me the blurb is not accurate, as the sample files are not self-contained. I'm curious exactly what's meant by "self-contained" or "independent".

Start with the README section "Using the Sample Code" and the referenced Samples/Payments/Payments/AuthorizationWithCaptureSale.php file. Confirm what "independent" and "self-contained" are intended to mean, then update the wording to match the documented dependencies and verify the links and examples remain accurate.