Código:
$url="http://<dc>.api.mailchimp.com/1.3/?output=OUTPUT_FORMAT&method=SOME-METHOD&apikey=xxxxxxxxxx&id_list&email_address=".$bean->email."merge_vars[FNAME]=".str_replace(" ","%2C", $bean->first_name),"merge_vars[LNAME]=".str_replace(" ","%2C", $bean->last_name),"merge_vars[STATUS]=".str_replace(" ","%2C", $bean->status);