I dont think they will. (Has Plastiq shut anyone down, they reject payments but I am not aware of any shutdown) I push much more than that through Plastiq. Another Idea is to set up weekly recurring payments. If your dealdine is Sept 30th, you can schedule 10 payments and have them automatically resend each week until 9/30. Much less work. I also make each payment a differnet amount but suprisingly, I have never had an issue (knocking on wood).