Here's our next update for great marketing instruments. These payment providers are very reliable and would be especially helpful for your NGO. Check out our list:

Payment provider
•DigiStore24 - A very good German payment provider that is fairly new on the market, but already able to establish very good since the beginning.

•Clickbank - The world's largest provider of digital products also acts as a payment service provider (sales of products). For the traffic formula you can  use Clickbank as a payment service.

• Shareit- A large payment providers and marketers representing some of the major German Internet.