If make the cure the mortgage, and give the borrowers a few $grand cash, they make out better than having a foreclosure permanently on their record and losing the house to auction. 

Together with that deed, you should give the seller a letter as an acknowledgement of the deed being given freely as a cure for the default, that clears the seller from you or that partner from laying future claims as to your rights being circumvented.

I second what @Jon Holdman  said.Remember if you purchase the property from the owner, they must file a notice of intent to cure 15 days before the sale date or the bank does not have to let them get out of the foreclosure.Sub2 deals work in high appreciation markets.

THERE IS NO CURE.

Last thought, the only thing I can think of is that when the card was opened, the income of the company may have been used, that income may then be reduced, a new application can cure this by stating other income (if it's true).

You don't want a bedbug infestation that takes 3 or 4 months to cure, or a broken water or sewer main to cause you to go bankrupt. 

You act as if you hold the cure for cancer or something.

In that case, issue a cure or quit notice referencing this lease clause and the corresponding safety code and or ordinance.

The contract is assigned and the ability of the new holder of the contract finds they can't execute and convey title.  4, investors need to always consider how their contracts will or could be effected by "life events", people die, become incapacitated, divorce, go bankrupt, they may be sued, medical liens by government can come into play and people are incarcerated.5. murphy's law applies.All these issues can generally be cured in time.

Full on Preventative Measures are the only cure as we know it.