hdfc card usage coupon on appolo pharmacy

i got a mesage  with a link and code  worth from hdfc for the credit card usage. after clicking the link and entering otp many lists come except amazon and flipkart.

Please help me if  i can buy amazon or flipkart with this  by waiting ?

another question is that , there is appolo pharmazy redeemable worth 1000 gift card option is there, if i buy medicins from appolo pharmacy can i use discoutn codes of appolo pharmacy and this gifdt card both? because netmeds is not allowing

so please help if anyone knows