Well as you said ebay only accepts paisa pay processor ,it is introduced by ebay only.
PaisaPay is the safest and most secure way of making online payments on eBay. Buyers can use PaisaPay to make free and instant online payments through credit card or online bank transfer.
You can pay by credit card or bank transfer if you wish paisa pay option.
For more details you can follow this
Paying using PaisaPay