Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can anyone else make an online payment for me?
Your relative in the US could buy a pre-paid Visa (aka Visa gift card) and give you the numbers on that to pay.  They're available for purchase at many grocery/convenience stores.  In most (all??) cases there'll be a fee of a several dollars charged in addition to the face value of the card. The biggest headache I can think of would be that pre-paid cards are generally only available in $25/50/100 increments; unless the current SAT price matches one of the standard increments they'll have to buy the next card size up and then get the remaining money off it in a separate transaction.  A grocery store would be one of the easier places for your relative to do this because cashiers there are used to splitting transactions across multiple payment sources (something not true at most other types of business) due to regularly processing transactions partially paid for via welfare benefits.