The first two are good. You might also say pay the bill in full or receive payment in full. I tried to stop her leaving in vain At large can be used as a criminal who has not been caught: The murderer is still at large or to describe someone (usually in media) with a free role. You often have an editor at large

I agree with the answers Jazz gave. But "at large" can also have another meaning of "without a specific assignment." For example: "He was the correspondent-at-large for his newspaper," meaning that he could report on anything and was not limited to a specific area of reporting, such as sports or politics.

You have 'in full' and 'in vain' used correctly. "In vain" Example: "I have tried and tried to fix this relationship, but alas it has all been in vain." "In full" Example: "I am going to need that payment in full." I would use "at large" like someone is on the run and hasn't been captured or still out there so to speak. Example: "Bonnie and Clyde are still at large." or "The woman is recovering from the attack, but the criminal is still at large."