How to update a contact in Dynamics365 using AlexaCRM php-crm-toolkit

I am trying to update a contact in Dynamics365 using PHP CRM toolkit https://github.com/AlexaCRM/php-crm-toolkit, I don't understand what does 'guid' represents here?

$contact = $service->entity( 'contact', $guid );

Also where can I find a list of 'FieldNames' so that I can create a new contact/account?

Solution

To get the field names go to Sales dropdown, select Settings, customizations, Customize the system, a new window will pop up, from the left side of new this window choose Entities->Account(Or any module you want)->Fields. On the right side you will get a list of field names with there details.

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