This assignment can be found in its entirety on Illium, which you can only access after completing the core mission on Horizon. Even then, this assignment will only be available if you helped Gianna Parasini take down Anoleis in Mass Effect 1.

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(1 of 3) After meeting with Gianna Parasini, she’ll try to rope you into another sting operation.

Should those conditions be met, travel to Illium and find Gianna Parasini sitting at a table in the Trading Floor area, near the stairs which lead to Liara’s Office. Engage in some small talk with her and she’ll very quickly remember she has business elsewhere. Read the note she left behind to find out she’s trying to enlist you in another white collar crime bust.

Her target is the merchant over at the Serrice Technology kiosk, so head on over there and pick the option “I want advanced merchandise.“ to help Gianna out, or pick “You’re being watched.” to sabotage the effort. In the latter case you’ll anger Gianna and won’t get any XP for this assignment, although it’ll still be listed as complete. In the former case you’ll have to pass a Paragon/Renegade check to advance if you didn’t haggle for a discount earlier. Should you manage to get the information out of the merchant, Gianna’s trap will spring closed and you’ll need to talk to her at the table where you met her to complete the assignment, earning 40 (50) XP in the process.