+1 ... Precisely for the above reasons..
+
It acts as an ADDITIONAL* card for offers on Amazon ( even though you would normally get 5% instant discount + 5% unlimited CB if you are a prime customer )..
*By additional I mean , if you exhaust your maximum discount limit on core card say for e.g. Rs 1,500 or 1,750) during a particular sale.. then you can use this APAY card to get another Rs,1,750 discount for other orders..