Yesterday I came across
this alternative payment system (go to the bottom of the home page to change the page content based on your specific country of interest).
It's based on a custom POS and accepts several payment alternatives. It has SDKs and APIs for the developers.
Nowadays we have quiet a few alternatives for payment methods. It could be helpful to have a single thread where all the tested ones (by B4xers) are grouped and compared.
Feel free (and encouraged) to add posts highlighting pros and cons of methods you had hands-on exeperience with.
TIA