I'm visiting China for the first time in March. I'm a US citizen. I have a 20 hour layover in Beijing on the way, then 5 days in Shanghai, then a 20 hour layover in Beijing on the way back home. I plan on going into Beijing both times.

I understand that I need a multiple entry L visa.

I'm looking at the visa service company's website, and besides airplane and hotel reservations, they are also asking for an invitation letter. How do I get that?

Is an Expedia reservation (without buying) sufficient for the hotel itinerary?

Lastly, who are you people using for a service? Seems like they all want $49 plus $26 for FEDEX, which is fine. Is one better than the others?

Thanks.