Web development

I need some changes to an existing website. I'm using phptravels script and I need a implementation of new payment sistem from HalkBank (online processing credit card payment system) I have POS merchant account for visa and mastercard and the code which need to be implement into script need to have this option in admin and company control panel. Client ID : xxxxxxxxx Username : xxxxxxxxx Password : xxxxxxxx Storekey : xxxxxxxx Store Type : 3D_PAY_HOSTING Currency Code : xxx 3D Post Url. : [login to view URL] Api Username : xxxxxxx Api Password : xxxxxxxxxx Api URL : [login to view URL] Because old payments in script has option only admin to have acceess to payment section (B2C) I would like with this modification every new company registered on the site like operator/merchant to have option to set their bank account only from halkbank and when someone make a payment then payment to goes on their bank account. If company doesnt have halkbank payment to be able from admin panel to enable/disable that option for the new registered company. Script is B2C and with this small modification need to be B2B.