Hi Tomarnst,
I think you can use this plugin to sync your customer contact information into FA. It regardless what Shopping Cart you are using. You can call the interface as below:
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$_company_name = "ABC Co";
$_short_name = strtolower(ereg_replace("[^A-Za-z0-9]`~!#'\"", "", str_replace(' ', '', $_company_name)));
$_first_name = "Your Name";
$_last_name = "Lim";
//Create Debtor Master
$param = array("company"=> $_company,
"user_id"=> $_uid,
"password"=>$_upswd,
"id"=>"",
"company_name"=>$_company_name,
"short_name"=>$_short_name,
"first_name"=>$_first_name,
"last_name"=>$_last_name,
"address"=>"123, Jalan ABC, Malaysia",
"email"=>"abc@yahoo.com",
"phone"=>"60311111111",
"mobile"=>"6012222288",
"fax"=>"",
"tax_group"=>"GST Tax",
"tax_id"=>"GST8888",
"area"=>"Asia",
"country_code"=>"MY",
"currency_code"=>"MYR",
"customer_type"=>"Retail",
"payment_terms"=>"Cash Only",
"credit_status_id"=>"1",
"notes"=>"Good Customer");
$antResults=$soapclient->call("create_debtors_masters",$param);
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Hope it help...