(often for an outcall provider) to see only him.  SHE arranges the room & he reimburses cash for the cost PLUS her donation.
If the room is for her general use, he might offer something extra if she does not have an incall or it might be money up front deducted from the fee.  I recommend meeting slightly before the time outside, fronting the room fee and she calls you with the room number.  I have done this myself...  worked out fine.  
It's best to pay as you go & it's generally not a good idea to be "loaning" or being "owed" money by a provider.  Appointments become hard to coordinate or impossible, performance suffers.    
skb

In my book this would pretty much be an out call.  Pay for the room, have her meet you, have your fun and then leave after she does. I have no issue with paying for the room but I would never leave her there to use it for seeing other clients...

A regular provider I see is asking me to help her with the money to get an incall room. This is the first time that's happened, should I be concerned? And, will I be expected to pay the full donation too? I'm seeing her this afternoon, so I hope I get some replies quickly. Thanks.

Ask her before agreeing...even if you make an agreement on payment DO NOT leave the hotel without checking out (don't let her keep the room for the night)...she can do anything from run up the bill with internet/movie/room service charges to smoke in the room...either way it costs you $$$$

I have done it once with a provider I was comfortable with. The price of the room was deducted from her donation amount. I would only do it if it was someone that I felt I could trust. AndI would not let her keep the room for other clients unless it is in her name. Good luck

She's getting the room, I'm just paying for it.

Thanks. I've seen her enough times that I trust her and I'm sure she'll deduct it from the donation. I'm just a little concerned cause this is the first time it's happened to me in my fairly short hobbying life and just wondering how often it happens.

It worked out fine. I trust her and there were no surprises. In fact, it was one of our best sessions so far Thanks again for the input.

Even with a lady you know.

Do not use your credit card. Give her the cash to deduct from the regular donation. I would also expect an additional deduction due to the additional cost to your time, or add maybe a 1/2 hour to your session at no additional cost.