They're about 1.80 a piece of mail, but they're handwritten and sent on greeting card style stationary. 

@James WiseI am going to borrow the money to pay my buyers agent from a crocodile lender, then ask the seller to sell it subject to and finance 100% the equity at 0% interest I will then take an advance on a credit card that is 0% and within 12 months I will be able to refinance everything when rates go back to 3%.

Yes, the PA's will be there handing out cards and trying to get your business as the fire is being put out. 

You should have reserve funds sitting in a savings account as well as credit lines and credit cards for backups.

Adding another 95% LTV on 7% is just not in your cards.

I also put all of the materials for the project on credit cards (don't recommend) so I was about $30,000 in credit card debt before I finished and paid off my debts.

They're targeting credit card companies, banks, hotels, airlines, utility providers, food delivery service, restaurants, auto dealers, event ticketing companies, and last but not least, property management companies.

If so, how do you secure the authorization on their card past 30 days?

By the time i met them they started defaulting on the sellers loans they did not have the money to pay for the evictions and the whole house of cards came tumbling down..

Open up at least three credit cards.