E-Certs do not go into your My Wallet, but you can add them to your My Account Discount Codes. Go to your My Account, select Valid under Discount Codes, then select the link "Add a Discount Code".

Unfortunately, you can never use 2 Discount Codes at once. The only workaround would be to break up a flight into 2 one-ways or something similar, but with the Companion Cert there really is not a workaround here.

The nice thing with Ecerts is that the expiration date is a "book by" date and not a "travel by" date.

Good luck......