Proof of payments should be sent to the other party. 

I always make my offer and include a POF(proof of funds) letter showing the seller that I have the funds to close.

Note origination where the borrower owns multiple properties with little or no debt, needs a loan for an acquisition, but can’t produce proof of income sufficient to get institutional financing.  

Many borrowers file this form as an exclusion to their US federal taxes as they may have been taxed by the country where they are earning the income.Required Documentation for Foreign IncomeWhen it comes to processing foreign income for a loan, documents required may include:» Most recent personal tax returns» History of receipt» Proof of continuance of foreign income earnings» Conversion of the income from the foreign currency to US dollarsThese documents must be translated or completed in English so that a loan reviewer can properly evaluate the information provided.Fannie Mae & Freddie Mac GuidelinesIncome from Foreign SourceIncome from foreign sources must be reported on the borrower’s most recent U.S. individual federal income tax returns.

The simplest way to raise capital is by presenting a compelling investment opportunity, clear execution plan and a track record or at minimum a proof of concept.

Also check and verify income (and proof of with paystubs and/or tax returns), verify rental references etcYou will want to have a minimum requirement for approval (such as credit score, income etc)  and state that in your advertisements.Good luck! 

We would certainly want to have our basic needs covered, and the occasional emergency, and be inflation proof.

Please - do this today: Send her a Notice To Quit for Non-Payment of Rent; you will need to send this to her via USPS with proof of delivery required so you can use it in any legal proceeding.

My suggestion for having it signed was more to give you proof that you gave it to them, when and that they received it...just in case they say they never received it. 

Just make sure to vet them carefully and ask for references from past deals and proof of their track record.