Create Receive Renew Payment Operations

This section will be describing how developers can call payment related functions in this server API.

API Root URL: https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment

Prerequisites:

1. You must know how to convert data into/from Base64 encoding
2. You must know how to convert data into URL encoded format
3. You must know how to read cryptography data that stores on your side through files in binary format/any other applicable format
4. You must know how to use query string in HttpGet
5. You must know how to convert data into/from JSON string

https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment/
https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment/CheckPayment?
https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment/RenewPayment?

These 3 endpoints act differently and have different purposes

1st Endpoint: Create Payment

https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment

This endpoint was responsible to request server to generate a payment request.

Here's an example on how to do it.

CheckOutPageHolderModel PageHolder = new CheckOutPageHolderModel();
Boolean CheckServerBoolean = true;
using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://mrchewitsoftware.com.my:5001/api/");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(
        new MediaTypeWithQualityHeaderValue("application/json"));
    var response = client.GetAsync("CreateReceivePayment/");
    try
    {
        response.Wait();
    }
    catch
    {
        CheckServerBoolean = false;
    }
    if (CheckServerBoolean == true)
    {
        var result = response.Result;
        if (result.IsSuccessStatusCode)
        {
            var readTask = result.Content.ReadAsStringAsync();
            readTask.Wait();

            var Result = readTask.Result;
            if (Result != null && Result.CompareTo("") != 0 && Result.Contains("Error") == false)
            {
                //Temporarily store the PayPal checkout page URL and order ID
            }
            else
            {
                //Display Error
            }
        }
        else
        {
            //Not able to request server to create a payment
        }
    }
    else
    {
        //Server's offline
    }
}

2nd Endpoint: Verify Payment

https://mrchewitsoftware.com.my:5001/api/CreateReceivePayment/CheckPayment?

This endpoint was responsible for verifying payment on server side.

Here's an example on how to do it.

Byte[] ClientECDSASK = new Byte[] { };
Byte[] SharedSecret = new Byte[] { };
Byte[] OrderIDByte = new Byte[] { };
Byte[] NonceByte = new Byte[] { };
Byte[] CipheredOrderIDByte = new Byte[] { };
Byte[] CombinedCipheredOrderIDByte = new Byte[] { };
Byte[] ETLSSignedCombinedCipheredOrderIDByte = new Byte[] { };
Byte[] ED25519PK = new Byte[] { };
Byte[] SignedED25519PK = new Byte[] { };
Byte[] MergedED25519PK = new Byte[] { };
Byte[] CipheredED25519PK = new Byte[] { };
Byte[] CombinedCipheredED25519PK = new Byte[] { };
Byte[] ETLSSignedCombinedCipheredED25519PK = new Byte[] { };
Boolean CheckServerBoolean = true;
RevampedKeyPair MyKeyPair = SodiumPublicKeyAuth.GenerateRevampedKeyPair();
FileCreationModel DirectoryHolder = new FileCreationModel();
String ETLSSessionID = "";
ETLSSessionID = File.ReadAllText(Application.StartupPath + "\\Temp_Session\\" + "SessionID.txt");
if (OrderID != null && OrderID.CompareTo("") != 0)
{
    if (ETLSSessionID != null && ETLSSessionID.CompareTo("") != 0)
    {
        ClientECDSASK = File.ReadAllBytes(Application.StartupPath + "\\Temp_Session\\" + ETLSSessionID + "\\" + "ECDSASK.txt");
        SharedSecret = File.ReadAllBytes(Application.StartupPath + "\\Temp_Session\\" + ETLSSessionID + "\\" + "SharedSecret.txt");
        OrderIDByte = Encoding.UTF8.GetBytes(OrderID);
        NonceByte = SodiumSecretBox.GenerateNonce();
        CipheredOrderIDByte = SodiumSecretBox.Create(OrderIDByte, NonceByte, SharedSecret);
        CombinedCipheredOrderIDByte = NonceByte.Concat(CipheredOrderIDByte).ToArray();
        ETLSSignedCombinedCipheredOrderIDByte = SodiumPublicKeyAuth.Sign(CombinedCipheredOrderIDByte, ClientECDSASK);
        NonceByte = SodiumSecretBox.GenerateNonce();
        ED25519PK = MyKeyPair.PublicKey;
        SignedED25519PK = SodiumPublicKeyAuth.Sign(ED25519PK, MyKeyPair.PrivateKey);
        MergedED25519PK = ED25519PK.Concat(SignedED25519PK).ToArray();
        CipheredED25519PK = SodiumSecretBox.Create(MergedED25519PK, NonceByte, SharedSecret, true);
        CombinedCipheredED25519PK = NonceByte.Concat(CipheredED25519PK).ToArray();
        ETLSSignedCombinedCipheredED25519PK = SodiumPublicKeyAuth.Sign(CombinedCipheredED25519PK, ClientECDSASK, true);
        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri("https://mrchewitsoftware.com.my:5001/api/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));
            var response = client.GetAsync("CreateReceivePayment/CheckPayment?ClientPathID=" + ETLSSessionID + "&CipheredSignedOrderID=" + HttpUtility.UrlEncode(Convert.ToBase64String(ETLSSignedCombinedCipheredOrderIDByte)) + "&CipheredSignedED25519PK=" + HttpUtility.UrlEncode(Convert.ToBase64String(ETLSSignedCombinedCipheredED25519PK)));
            try
            {
                response.Wait();
            }
            catch
            {
                CheckServerBoolean = false;
            }
            if (CheckServerBoolean == true)
            {
                var result = response.Result;
                if (result.IsSuccessStatusCode)
                {
                    var readTask = result.Content.ReadAsStringAsync();
                    readTask.Wait();

                    var Result = readTask.Result;
                    if ((Result == null || Result.CompareTo("") == 0) || (Result.Contains("Error") == true))
                    {
                        //Display Error
                    }
                    else
                    {
                        //Get Folder ID from the JSON result and create a local folder based on that ID at client device
                        //Store ED25519 SK and PK in the client machine
                    }
                }
                else
                {
                    MyKeyPair.Clear();
                    return false;
                }
            }
            else
            {
                MyKeyPair.Clear();
                return false;
            }
        }
    }
    else
    {
        MyKeyPair.Clear();
        return false;
    }
}
else
{
    MyKeyPair.Clear();
    return false;
}