Insert the gift card at pump and fill up, no PIN is needed.
The card is locked if you buy the card online (to avoid loss) from Petronas Dagangan.
The gift card from Maybankard Centre (redemption of Treatpoints) is not locked.
You may buy the gift card unlocked at certain Petronas stations.
Anytime you can top up at cashier, but I don't really know which stations will accept Ikhwan Visa to top up (during weekend, so you can use the credit in the gift card for fuel on weekdays).

Yes. The cards I bought at Shopee in July, the expiry is June 2022.

Petronas Dagangan (Mymesra, Tel 1300-888181) just joined at Shoppe and Lazada.
Not always you can buy the cards at discounted price.
The RM105 value was sold at RM100 in February.
Limited quantity was sold at RM45 for RM50 value at Shoppe in July.
RM100 card was sold at RM100 - RM10 voucher at Lazada this week.
https://www.facebook.com/PETRONASBrands/
https://shopee.com.my/SEA-Games-2017-PETRON...95651.446112157
Of course I am more interested if I can top up online (not available yet) or at petronas stations.

Haha I never had chance to pay at RM50 for the card.
Now they sell it at RM48.
Shopee allow you to buy 1 card only per user.
Find a way, let me know as well. 

Don't forget, Lazada may be categorized as Direct Marketing now and disqualified from PBB's game.
I wish I could find a cashier to swipe RM50 to topup the card.