I'm a new dev php.i don't to know how integrate the API of this site http://www.bestvoipreselling.com/features I would like a detailed explanation in the first instance please.
https://www.voipinfocenter.com/API/Request.ashxcommand=&username=&password=______&customer=&customerpassword=___&geocallcli=&tariffrate=_

Variable Value Option Description
command createcustomer Mandatory
username X..140 Mandatory the username of the reseller
password X..100 Mandatory the password of the reseller
customer X..140 Mandatory the username of your new customer
customerpassword X..100 Mandatory the password of your new customer
geocallcli X..23 Optional the phone number of your new customer
tariffrate N..100 Optional the ratelist to apply

They should provide you with API documentation. If you don't have it I suggest you contact them.

Apart from that, what is unclear in the above description?

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