According the complaint, one way sounds a lot like it was stolen from a BAD spy novel.
Ummm no, right from real life.

This is called "sign and counter-sign" - another phrase you might hear is "bonafides".

(This is pronounced as "Bona Fidies")


bona fides

/bon fideez/
• noun 1 honesty and sincerity of intention. 2 treated as pl. informal a person’s credentials.