The site Pradeep is working on ([url removed, login to view]) uses the Icelandic currency, krona, as its operating currency. One krona is one credit. However, a) as Iceland is very small and has a very unique currency, and b) as this is a multi-lingual site, to be offered in many countries, using both Icelandic credit card processors and global ones such as PayPal, Verotel, etc; it is necessary to offer customers the option of buying their credits in more currencies than just krona, and to give them the option of checking the exchange rate as it is at the time of purchase.
Pradeep therefore needs to create a real-time currency-conversion mechanism that reads the exchange rate as it is at the time of purchase from the banks site, and applies that rate to the purchase, depositing Icelandic krona in the the account of the user regardless of the currency used for the purchase. Also, the user must be given the option of checking the exchange rate, verifying that it is indeed correct.