Card payment acceptance with ePaisa is currently available in India only. Additionally, card payments across border are unsupported. This means that card transactions attempted outside of India where you activated your ePaisa account can not be processed with ePaisa.
However, you can accept cash transactions while traveling internationally. Also, if you have an Indian bank account, you can also process international cards.
Please Note: If you experience issues while processing an internationally-issued card, have the cardholder contact their issuer.