Help Me Connect the Remote Server through VPN -- 2

Hello, I need to get my php site integrated with the Postal server. This is what their IT has provided. They also told me that the connection should be established through VPN. Anyone can help me? More info: In order to get authorized via Web Server, the HTTP Request Header should contain the username and password in Base64 format. Example: • string url = " [login to view URL] "; • WebRequest request = [login to view URL](url); • string auth = [login to view URL]("{0}:{1}", "USERNAME", "PASSWORD"); • string enc = [login to view URL]([login to view URL](auth)); • string cred = [login to view URL]("{0}{1}", "Basic", enc); • [login to view URL][[login to view URL]] = cred; Description of methods The methods are also available at : [login to view URL] 1. Registering the parcel Request Type: Post [login to view URL] Request Class: Parcel_Request Response Class: Parcel_Response Request format: { "CodCurrencyId": 1, "CodPrice": 100.0, "deliveryMethodID": 1.0, "comment": "sample string 1", "customerParcelCode": "sample string 2", "height": 1.1, "width": 1.1, "length": 1.1, "internalCode": "sample string 3", "isExpress": false, "isHand2Hand": false, "needCertificate": false, "needSecondTry": false, "stayInSC": false, "parcelTypeId": 59, "transitTypeId": 126, "weight": 11.1, "receiverCustomer": { "addressNote": "sample string 1", "cityID": 1, "firstName": "sample string 3", "lastName": "sample string 4", "phone": "sample string 5" }, "senderAddress": { "AddressNote": "sample string 1", "CityId": 1, "CountryId": 63 } } Response format: { "InternalCode": "sample string 1", "Status": { "Code": "რიცხვითი კოდი", "Description": "ტექსტური აღწერა" } }