I find that if things are well documented and reasonable, they are pretty good to work with.  

That document they provided, with all the colored font, was a mess to wade through.

Their rates are good but boy, they looked at my financials and ask some funny questions such as asking for proof that I could withdraw funds from my SEP IRA account, and that I need to provide documentation to verify that  this employer sponsored retirement account allows for funds to be withdrawn, or if withdrawals could only be made in connection with the borrowers employment termination, retirement or death etc. everyday they sent me something new to answer.

So we signed the documents and paid the closing costs.

As with an STR, so long as you set and document clear expections, it is on the guest or tenant to proceed accordingly. 

Supposedly, after signing participation agreement (I haven’t seen the documents yet), you can pay it off next day and essentially just pay 100% of the first mortgage acquisition price.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

And the obvious, again well documented, FOR PROFIT.... 

Here are all my notes on investing in properties out-of-state, which is also the same as international to the United States.My notes are from David Greene's book, Long-Distance Real Estate Investing: How to Buy, Rehab, and Manage Out-of-State Rentals. https://docs.google.com/document/d/1blQFIKSls6JDHdl7srVMhXd8...For personal experience on flipping remotely, I wouldn't be the best person to speak on this.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?