Sunita took her niece, Aishwarya for shopping to 'Benetton' to buy her a dress on the occasion of her birthday. She was delighted when on payment for the dress she got a discount voucher to get $20 \%$ off for a meal of $\text{₹}\,5\,0\,0$ or above at a famous eating joint. Identify the technique of sales promotion used by the company in the above situation.