Going from this:
There is a quickstart guide but no further documentation.
For example in the quickstart quide it shows you how to get a list of contacts by email. By default this example only gives you ten results, how would i up this to say 100 (like you can do in the online test area).
Just seems like a very verbose API package with no actual PHP specific doucmentation?
Are you using the PHP library?
@Nickm66 , we are working on providing more documentation on these libraries.
In the interim, keep in mind that it is an open source project so if happened to create a md file and called it “cheatsheet” and if you happened to add tips to it, I wouldn’t complain 
I ened up interrogating the \codegen\crm\companies\model\PublicObjectSearchRequest class and worked out you can use the setters there e.g.
setLimit
so for future searchers this would be as simple as:
$searchRequest = new \HubSpot\Client\Crm\Companies\Model\PublicObjectSearchRequest();
$searchRequest->setFilterGroups([$filterGroup]);
$searchRequest->setLimit(100);
See how much hubspot stuff i need to do, might get round to a cheat sheet 