Pakistan in the middle: What benefits and risks from being US-Iran mediator?

There are those who want the US and Iran to settle, and those who want regime change. Among the latter, there's of course Israel and then there's the United Arab Emirates, who've signaled OPEC's cautious response as a reason for quitting the cartel. Is this the end of OPEC? How will its biggest producer Saudi Arabia respond? The Emirates also seem to have it in for Saudi ally Pakistan, by suddenly demanding the immediate reimbursement of a $3.5 billion loan from the cash-strapped facilitators of US-Iran mediation efforts.