The incident occurred on Friday just before 2pm.
A Stratford resident attended the Shoppers location at 511 Huron Street and attempted to purchase two $500 visa gift cards.
Staff at the store were concerned regarding the purchase and discovered the female had been contacted by phone and advised she had won $1 million dollars.
All she had to do was pay a service charge of $1000, and the money sent to the seller.
The Stratford Police commended the staff on identifying the situation and prevented a community member from being taken advantage of.