All the early testimony, from Trump employees, made it clear the rules were the "Boss" gets told all, when it comes to finances as well. He's a cheap penny pincher, wanted no invoice to be paid without negotiating down from promised payment for the work. Any check signed over $10,000 had to be approved by him first, and testimony from all the workers that CFO Alan Weisselberg went over everything, every decision, with Trump, they spoke several times a day re: business expenses. Michael's reimbursement checks were for $35,000 a month for a year, totalling the $420k, and 9 were signed by Trump, the other months were signed by Eric Trump I believe....and the rule was, no check over $10,000 signed by his sons and others authorized can not go through without Trump being told exactly what the payment was for.... The payments signed by Eric were $35k checks, over the $10k limit.... So Trump as a micro and macro hands on boss, was told, without any doubt, how the $35,000 a month checks for Cohen were calculated and determined.
As a witness, Cohen identified his own hand written notes on the $50k for Red Finch expenditure plus the $130 k for Stormy NDA invoice where Alan Weisselberg wrote his hand written notes on how they were going to pay Cohen back....Alan used Cohen's hand written notes and type written NDA amount, doubling to cover Cohen's taxes plus the bonus, to come to the $420 k.
Cohen identifying his own writing put him in the room with Weisselberg, and showed that their business records were most certainly, intentionally falsified.
It was not a retainer fee as claimed, for work done monthly, in 2017. It was clearly, with the Weisselberg notes, repayment for Cohen 2016 NDA Payment to stormy Daniels, plus a couple of other expenses of his and bonus, for 2016....
look above.
I answered this in my opinion on your first question.