Ads posted on Zillow automatically go out to 8 or so other sites.

If the property is deeded in a way that title pass automatically to the widow, then the title company can most likely prepare the documents.If however the property is not titled in a way that title passes to the widow automatically, the widow may need to initiate probate proceedings for the deceased husband.

That would be quite annoying to have to do that if I've already imported the transaction automatically from my credit card since it's linked, but I don't know if the receipt is required or not..

BP automatically tags them with their definition. 

if they answer yes, i reject them automatically.. 

Not sure about Missouri but in AZ it also gives me an automatic judgment that I can send to collections which also haunts the tenants history and protects the rest of us.

They also come with some handy features like automatic late fees and the ability to refuse partial payments (useful if you're in a state where a tenant can halt eviction proceedings by paying you any amount of the rent owed). 

Some automatically do not approve applicants with multiple collections regardless of what they are for, while other look more specifically at the nature of the collections. 

Therefore before automatically re-signing, I would look to see what other rentals are out there. 

In many jurisdictions, judgments entered (or recorded) are automatic liens against all property owned by the debtor in that jurisdiction.