[X][Proof] Ask for 3 distinct objects which they will provide. Proceed to infuse energy into them, and have them obscure the items among similar ones. Point out the ones which have the energy infused in them. Continue with similar tests they themselves devise until they are confident in your ability.
[X][Anything Else] Inquire on PRT policies regarding Rogues, and ask about the best ways to obscure identities when making money while using a parahuman power.
[X][Proof] I'll prove that I can emit energy and detect that energy. (Request an object you can shoot an harmless but flashy Elemental Ray at, and use your power on it in front of them)
[X][Proof] I'll prove that I can emit energy and detect that energy. (We will generate a basic mana type which is visible, we will then cause basic effects using invisible mana types. Afterwords if they are willing, we will use See the Unseen on them, or a willing test subject, to demonstrate that the energy can be seen through the use of our power.)
[X][Proof] I'll prove that I can emit energy and detect that energy. Request some identical plants, infuse one of them with plant mana, then show you're able to tell which one you infused with no visual cues, or if you're confident in your ability to do so even while hidden in some opaque box.
[X][Anything Else] Ask if there is anything we can legally sell to the PRT that they're actually willing to buy, that wouldn't be legal to sell to anyone else, or any other way to earn money they recommend while remaining strictly neutral and not part of Protectorate. Look at Armsmaster as you do so.
[X][Proof] I'll prove that I can emit energy and detect that energy. (Pull out an aluminum scrap, infuse it with mana and then generate some glass mana for a visible effect and have someone take it out of the room and point to where it is.)
[X][Proof] I'll prove that I can emit energy and detect that energy. (Request an object you can shoot a harmless but flashy Elemental Ray at, and use your power on it in front of them)