I have e-wallets like Orange Money and Zain Cash. I use these to pay water and electricity bills and traffic fines on behalf of the clients. Is it permissible to charge a commission for this service? For example, if the electricity bill is 10JDs, the client pays me 11JDs. If the client transfers 100JDs through one of the e-wallets, I take 5JDs out of that sum. Is this permissible?