C# with PayPal Donate needs IPN and Mail to payer

There is a PayPal Donatebutton in a C# Form.

Existing PayPal button action:

var url = "[url removed, login to view]" +

@"?cmd=" + "_donations" +

@"&business=" + "mypaypal-mail" +

@"&lc=" + "US" +

@"&item_name=" + "Marlin 3D printer Tool Donation" +

@"&amount=5" +

@"&currency_code=" + "USD" +

@"&bn=" + "PP%2dDonationsBF";

(Missing IPN link)

Existing MANUAL License tool..

When I get the PayPal mail I enter name and email in my C# license tool

A mail is sent to the Donator: (In this case I sent it to myself)


Thank you for your donation!

This license key will remove the Demo mode of the Marlin3DprinterTool

This is the licenseKey for Marlin3DprinterTool


Copy the key and paste it into the Marlin3DprinterTool setup




After the mail is sent the data behind the Base64 string is appended to a file

The file with the donators look like this:


dawid86szewczyk(a)[url removed, login to view] ;Dawid Szewczyk ;License created:2017-03-19 16:46

winkboyer(a)[url removed, login to view];Bill Boyer ;License created:2017-03-21 07:09

[url removed, login to view](a)[url removed, login to view] ;Paul Curutiu ;License created:2017-03-21 07:11

pauldesmet45(a)[url removed, login to view];Paul De Smet;License created:2017-03-21 11:13

RanchoMattPS(a)[url removed, login to view];Matthew Dodd ;License created:2017-03-25 15:19

rtwallner(a)[url removed, login to view];Ron Wallner;License created:2017-03-27 09:37


Its the same string that created the Base64

Attached is the C# License tool

The project is to make this automatic.

* Add IPN to PHP page ([url removed, login to view]

* Verify IPN

* Get the name and Mail-adress from the IPN

* Create mail to payer with CSV with name and email as a Base64 (=license-key)

* Save the name and email in a file and/or MySQL database

Here is example of code:

[url removed, login to view]

[url removed, login to view]

[url removed, login to view]

[url removed, login to view]

Skills: PHP, Software Architecture

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