7-Elven is popular convenient store, with 6072 stores in Taiwan
 
Format: Link
Expiry date: At least 180days. 
How to redeem: Present e-voucher on mobile when check out(screen shot or print is not acceptable)
 
T&C:
1.  The eGift Card should be redeemed by 180 days from the date of purchase by going through URL and enter “Redeem Code”. The request to extend the validity of the offer or to use it after expiration will not be accepted.
2.  According to the provisions of Law, stores are not allowed to use e-vouchers to purchase cigarettes, pay for the collection and sale business, and sell goods on a commission basis
3.  This card is issued anonymously. If the barcode and card number cannot be identified due to use, theft, theft, loss, or malfunction of the mobile phone, the card cannot be refunded, reported lost, stopped payment or reissued