Had to look up "pin terminal" got:
https://www.airic-terminal.com/products_din_terminals_din_pin_terminals.html?gclid=EAIaIQobChMI4M-EwJSt9AIVrSGtBh2qIglbEAAYASAAEgKuvPD_BwEYou can just put the two wires into the bottom of the breaker without joining the wires first, if I have the correct thing in mind. The pin terminal idea is ok too.
I think you have the converter and another circuit using the same breaker (not the Main breaker though). I had that with the Parallax 7355 in the 5er we had.
The problem there was to be able to still run the 120v outlets via inverter with the converter shut off, so I was playing with that. Answer was to put a switch in the converter's black wire before it got to the bottom of the breaker. That way, I could leave the breaker on to run the 120v outlets and shut off the converter with the inserted switch.
If you got the Boondocker MBA version, AFAIK once installed you can't get at the adjustable voltage setting screw, but not totally sure about that. Last I heard, you needed the deck mount under there turned so you can get at the two holes in its side. The deck mount has a plug to go in a 120v outlet (ISTR Randy does a hard wired version though)