i've found only this:
What are the fees for payment via paysafecard at ELDEXchange?
The fees for using the service of paysafecard are 15 % of the order amount. According to our fee transparency policy, we will only charge the costs that we have to bear ourselves – free of premium. The fees for this service are relatively high, but unfortunately, this is something we cannot influence.
https://www.eldexchange.eu/en/news/paysafecard-new-at-eldexchange.html i can't check this because i don't play SL
if paysafecard don't have fees table, maybe it is client based charging, if u are big fish (u sell big amount odf stuff) u can get smaller fees