How to recognize it in the interface
01
The final order or plan has items that were not in your request.
Same moment, different copy (illustrative example)
Before
“Done. I also added priority delivery and a 12-month warranty.”
Shows the pattern
After
“Done. Priority delivery is 25 SAR extra. Add it?”
The fair alternative
Design guideline
Asks before adding anything that costs money and lists every extra.
Do
Asks before adding anything that costs money and lists every extra.
Don’t
Don’t add paid items without a clear yes.