For snelstart api version 1 use tag v0.0.5.
Snelstart api PHP wrapper class
composer require avancecommunicatie/snelstart-b2b-api
Simple example
require 'vendor/autoload.php';
$snelstart = new \Snelstart\Snelstart();
$snelstart->setApiKey([your api key here]);
$snelstart->generateAccessToken([your connection key here]);
print_r($snelstart->send('artikelen'));
Have fun, feel free to contribute.