what is the possibilities for a non US citizen to get mortgage?

Thanks Jan Non-U.S. citizens can receive FHA loans as long as they are permanent legal residents and have lawful residency in the U.S.

Not a lawyer but..... why would there be ANY issue with a private citizen paying a company via Zelle?

This is where, by law, attorneys or other citizens must post legal notice about everything from divorce filings to foreclosures. 

Self-represented in the sale, financing with Lowell Collman with Citizen's Bank.

There are exceptions and every municipality in every county and state is different, usually composed of a collection of municipal executive appointments and interested citizens.

As one of the richest countries in the world, many argue that we owe it to our citizens to provide these services free of cost.On the other hand, many wealthy individuals feel that they should not have to pay more taxes for others to receive free benefits.

Does anyone have any experience with being a US citizen and purchasing out of the country?

We partner with non-US citizens all the time and there are certainly advantages to it, but I did want to mention something I saw in your post.

They are not U.S. citizens and don't have a business here in the U.S.