The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much 15 US dollars in the form of an Amazon card is worth in naira today, one needs to check the current exchange rate.

Exchange rates are influenced by various factors such as economic conditions, market forces, and central bank policies. Financial institutions and currency exchange platforms provide the most up-to-date rates. By looking at these sources, one can find out the exact value of 15 US dollars in naira at the present moment.
It's important to note that when converting, there may be additional fees or margins depending on the method of conversion. Whether it's through a bank, an online currency exchange service, or other means, these costs can affect the final amount of naira received for the 15 US dollar Amazon card. So, it's crucial to consider all aspects and make an informed decision to get the best conversion rate for the 15 US dollars into naira today.