Crossword puzzle clue "proof you paid"

Proof you paid

Proof that you're who you say you are

You are proof of good deeds and you complete me, boy ...

"Being a ___ fan is like lending someone a lot of money and you just know that you'll never get paid back." (John Oliver)

Proof you weren't anywhere near the murder

Proof you have a lot

"Proof enough for you?"

"Nope, you had it right the first time," on a proof