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Payfort Integration with Asp.Net MVC from server side

Currently, We are assigning the values in the below form and post the data to payfort. Which works fine!!
<form method="post" action="https://sbcheckout.payfort.com/FortAPI/paymentPage" id=form1 name=form1>
<input type="hidden" name="signature" />
<input type="hidden" name="command" />
<input type="hidden" name="merchant_reference" />
<input type="hidden" name="amount" />
<input type="hidden" name="access_code" />
<input type="hidden" name="merchant_identifier" />
<input type="hidden" name="currency" />
<input type="hidden" name="language" />
<input type="hidden" name="customer_email" />
<input type="hidden" name="payment_option" />
<input type="hidden" name="order_description" />
<input type="hidden" name="return_url" />
But when we post the data throw above method it shows the credential information to others
Is there any way that we can post the data to payfort from our controller and redirect to posted URL ?

You can use: https://github.com/payfort/payfort-dotnet-sdk/
this is official dotnet SDK from payfort

Yes you can post data to payfort using .Net Client library https://github.com/payfort/start.net
steps to call payfort.
1) Generate card Token
pass open key and card detail.
2) create charge using card token
3) capture charge amount

How to convert HTML Form data into POST data in C#?

By using WebClient in C#, I can get the source of a page. Imagine that this HTML source always contains a form with a given name like this:
<form name="myform" action="page.php">
<input type="text" name="mytext" value="default text">
<textarea name="mytextarea">content</textarea>
<input type="password" name="mypass" value="12345">
<input type="hidden" name="myhiddenfield" value="code">
<input type="checkbox" name="mychb1" value="true" checked>
<input type="checkbox" name="mychb2" value="true">
<input type="radio" name="myradio" value="radio2" checked>
<input type="radio" name="myradio" value="radio1">
<select name="mychoice">
<option value="cherry">cherry</option>
<option value="orange">orange</option>
<option selected="" value="apple">apple</option>
</select>
<input type="submit" value="Submit">
</form>
Now I want to make POST data according to these values like this:
mytext=default text&mytextarea=content&mypass=12345&myhiddenfield=code&mychb=true&myradio=radio2&mychoice=apple
Note that mychb2 is not included because is not checked and also the names might be vary in each page source and there might be more or less than elements in the forms.
How can I do this?

Directing from registration form to online payment website

I am trying to link a registration form to an online payment website and I was given code from the payment website similar to the one below in order to link the two pages together. I don't see how I would implement this unless it's attributed to an asp:Button like below.
How would I make it so on the button click it would run through this form and this information would be sent? All this information is necessary and if it isn't sent then I just get an error page from the payment server.
<asp:Button ID="submitButton" runat="server" Text="Submit" OnClick="submitButton_Click" />
<form id="input_form" action="https://secure.checkout" method="post">
<input name="LMID" type="hidden" value="000935" />
<input name="unique_id" type="hidden" value="4567"/>
<input name="sTotal" type="hidden" value="150.00"/>
<input name="webTitle" type="hidden" value="2013 Conference" />
<input name="Trans_Desc" type="hidden" value="Conference Registration" />
<input name="contact_info" type="hidden" value="Contact web admin" />
</form>

Why not just do this?
<form id="input_form" action="https://secure.checkout" method="post">
<input name="LMID" type="hidden" value="000935" />
<input name="unique_id" type="hidden" value="4567"/>
<input name="sTotal" type="hidden" value="150.00"/>
<input name="webTitle" type="hidden" value="2013 Conference" />
<input name="Trans_Desc" type="hidden" value="Conference Registration" />
<input name="contact_info" type="hidden" value="Contact web admin" />
<input type="submit" value="submit"/>
</form>

paypal donation button integration in asp.net c#

it is required to integrate the paypal donation button in asp.net c# web form, on clicking the donate button an email should be sent to the receiver with capturing the details of the donor like donor name, occupation, address and donation amount etc.
Please any help from anyone will be appreciated.
thanks

First u go through with Paypal Documentaion... It is best source for to learn all the things which u require.
Paypal SDK Documentation
DOnation of paypal using Asp.Net : Custom Control
How to Use Paypal SDK.. Sample applicaiton.

Use this code for asp.net page for a simple donation button
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="myemail">
<input type="hidden" name="item_name" value="Item name">
<input type="hidden" name="item_number" value="Item ID">
<input type="hidden" name="amount" value="12.00">
<input type="hidden" name="buyer_credit_promo_code" value="">
<input type="hidden" name="buyer_credit_product_category" value="">
<input type="hidden" name="buyer_credit_shipping_method" value="">
<input type="hidden" name="buyer_credit_user_address_change" value="">
<input type="hidden" name="no_shipping" value="0">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input name="cbt" value="Click here to confirm the payment" type="hidden"/>
<input type="hidden" name="lc" value="US">
<input type="hidden" name="bn" value="PP-BuyNowBF">
<input name="CANCELURL" value='<%=errorurl %>' type="hidden"/>
<input name="return" value='<%=url %>' type="hidden"/>
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
'errorurl' and return url 'url' can be defined from codeback.
Also you can avoid unwanted parameters from the code.
You can set a custom image in the 'img' tag of the code.
Create a button of your own by using this link
https://www.paypal.com/cgi-bin/webscr?cmd=_donate-intro-outside

Resources mentioned are pretty good. To go through a live-setup example, you can visit this LINK and learn how you can achieve the same on your website.
NOTE: PayPal is integrated within a website, and doesn't offer a one-click solution like Web-API.

Using Paypal REST C#

I would like to use Paypal authenication service
https://www.paypal-labs.com/files/PayPal_Authentication_Service.pdf
The document is however missing some information,
<form method=post action=https://api-3tpaypal.com/nvp>
<input type=hidden name=USER value= API_username>
<input type=hidden name=PWD value= API_password>
<input type=hidden name=SIGNATURE value= API_signature>
<input type=hidden name=VERSION value=version>
<input type=hidden name=RETURNURL value=yourReturnURL>
<input type=hidden name=CANCELURL value=yourCancelURL>
<input type=hidden name=LOGOUTURL value=yourLogoutURL>
<input name=SERVICENAME1 value=Name>
<input name=SERVICEDEFREQ1 value=Required>
<input name=SERVICENAME2 value=Email>
<input name=SERVICEDEFREQ2 value=Required>
<input type=submit name=METHOD value=SetAuthFlowParam>
</form>
What VERSION? what is SERVICENAME1, SERVICEEDFREQ1?
etc?
REF: https://www.x.com/community/ppx/authentication

You do not need to send raw requests from C#.
Please download and use C# libraries + Code sample from here:
https://www.x.com/community/ppx/code_samples