At this time only the Paypal option exists. I have not read any additional documentation referencing other methods of payment.
Currently the only method of payment is via PAYPAL.
As far as I know there are no future plans to implement other payment options.
If there will be other payment methods introduced, it will be communicated in this forum and on the Intel® Atom™ Developer Program Website.
Intel® Atom™ Developer Program Team.
Paypal has good global coverage. Here is a list of the supported countries: